forked from OSchip/llvm-project
1229 lines
29 KiB
C
1229 lines
29 KiB
C
// RUN: %clang_cc1 -analyze -analyzer-checker=core,alpha.deadcode.UnreachableCode,alpha.core.CastSize,unix.Malloc,debug.ExprInspection -analyzer-store=region -verify %s
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#include "Inputs/system-header-simulator.h"
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void clang_analyzer_eval(int);
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typedef __typeof(sizeof(int)) size_t;
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void *malloc(size_t);
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void *valloc(size_t);
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void free(void *);
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void *realloc(void *ptr, size_t size);
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void *reallocf(void *ptr, size_t size);
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void *calloc(size_t nmemb, size_t size);
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char *strdup(const char *s);
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char *strndup(const char *s, size_t n);
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int memcmp(const void *s1, const void *s2, size_t n);
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void myfoo(int *p);
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void myfooint(int p);
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char *fooRetPtr();
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void f1() {
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int *p = malloc(12);
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return; // expected-warning{{Potential leak of memory pointed to by 'p'}}
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}
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void f2() {
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int *p = malloc(12);
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free(p);
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free(p); // expected-warning{{Attempt to free released memory}}
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}
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void f2_realloc_0() {
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int *p = malloc(12);
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realloc(p,0);
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realloc(p,0); // expected-warning{{Attempt to free released memory}}
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}
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void f2_realloc_1() {
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int *p = malloc(12);
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int *q = realloc(p,0); // no-warning
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}
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void reallocNotNullPtr(unsigned sizeIn) {
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unsigned size = 12;
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char *p = (char*)malloc(size);
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if (p) {
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char *q = (char*)realloc(p, sizeIn);
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char x = *q; // expected-warning {{Potential leak of memory pointed to by 'q'}}
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}
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}
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int *realloctest1() {
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int *q = malloc(12);
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q = realloc(q, 20);
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return q; // no warning - returning the allocated value
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}
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// p should be freed if realloc fails.
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void reallocFails() {
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char *p = malloc(12);
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char *r = realloc(p, 12+1);
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if (!r) {
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free(p);
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} else {
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free(r);
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}
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}
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void reallocSizeZero1() {
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char *p = malloc(12);
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char *r = realloc(p, 0);
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if (!r) {
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free(p); // expected-warning {{Attempt to free released memory}}
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} else {
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free(r);
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}
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}
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void reallocSizeZero2() {
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char *p = malloc(12);
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char *r = realloc(p, 0);
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if (!r) {
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free(p); // expected-warning {{Attempt to free released memory}}
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} else {
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free(r);
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}
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free(p); // expected-warning {{Attempt to free released memory}}
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}
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void reallocSizeZero3() {
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char *p = malloc(12);
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char *r = realloc(p, 0);
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free(r);
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}
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void reallocSizeZero4() {
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char *r = realloc(0, 0);
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free(r);
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}
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void reallocSizeZero5() {
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char *r = realloc(0, 0);
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}
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void reallocPtrZero1() {
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char *r = realloc(0, 12);
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} // expected-warning {{Potential leak of memory pointed to by 'r'}}
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void reallocPtrZero2() {
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char *r = realloc(0, 12);
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if (r)
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free(r);
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}
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void reallocPtrZero3() {
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char *r = realloc(0, 12);
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free(r);
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}
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void reallocRadar6337483_1() {
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char *buf = malloc(100);
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buf = (char*)realloc(buf, 0x1000000);
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if (!buf) {
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return;// expected-warning {{Potential leak of memory pointed to by}}
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}
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free(buf);
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}
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void reallocRadar6337483_2() {
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char *buf = malloc(100);
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char *buf2 = (char*)realloc(buf, 0x1000000);
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if (!buf2) {
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;
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} else {
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free(buf2);
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}
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} // expected-warning {{Potential leak of memory pointed to by}}
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void reallocRadar6337483_3() {
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char * buf = malloc(100);
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char * tmp;
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tmp = (char*)realloc(buf, 0x1000000);
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if (!tmp) {
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free(buf);
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return;
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}
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buf = tmp;
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free(buf);
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}
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void reallocRadar6337483_4() {
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char *buf = malloc(100);
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char *buf2 = (char*)realloc(buf, 0x1000000);
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if (!buf2) {
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return; // expected-warning {{Potential leak of memory pointed to by}}
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} else {
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free(buf2);
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}
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}
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int *reallocfTest1() {
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int *q = malloc(12);
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q = reallocf(q, 20);
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return q; // no warning - returning the allocated value
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}
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void reallocfRadar6337483_4() {
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char *buf = malloc(100);
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char *buf2 = (char*)reallocf(buf, 0x1000000);
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if (!buf2) {
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return; // no warning - reallocf frees even on failure
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} else {
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free(buf2);
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}
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}
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void reallocfRadar6337483_3() {
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char * buf = malloc(100);
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char * tmp;
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tmp = (char*)reallocf(buf, 0x1000000);
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if (!tmp) {
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free(buf); // expected-warning {{Attempt to free released memory}}
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return;
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}
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buf = tmp;
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free(buf);
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}
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void reallocfPtrZero1() {
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char *r = reallocf(0, 12);
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} // expected-warning {{Potential leak of memory pointed to by}}
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// This case tests that storing malloc'ed memory to a static variable which is
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// then returned is not leaked. In the absence of known contracts for functions
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// or inter-procedural analysis, this is a conservative answer.
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int *f3() {
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static int *p = 0;
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p = malloc(12);
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return p; // no-warning
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}
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// This case tests that storing malloc'ed memory to a static global variable
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// which is then returned is not leaked. In the absence of known contracts for
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// functions or inter-procedural analysis, this is a conservative answer.
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static int *p_f4 = 0;
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int *f4() {
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p_f4 = malloc(12);
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return p_f4; // no-warning
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}
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int *f5() {
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int *q = malloc(12);
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q = realloc(q, 20);
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return q; // no-warning
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}
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void f6() {
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int *p = malloc(12);
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if (!p)
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return; // no-warning
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else
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free(p);
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}
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void f6_realloc() {
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int *p = malloc(12);
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if (!p)
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return; // no-warning
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else
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realloc(p,0);
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}
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char *doit2();
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void pr6069() {
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char *buf = doit2();
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free(buf);
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}
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void pr6293() {
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free(0);
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}
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void f7() {
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char *x = (char*) malloc(4);
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free(x);
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x[0] = 'a'; // expected-warning{{Use of memory after it is freed}}
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}
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void f8() {
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char *x = (char*) malloc(4);
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free(x);
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char *y = strndup(x, 4); // expected-warning{{Use of memory after it is freed}}
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}
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void f7_realloc() {
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char *x = (char*) malloc(4);
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realloc(x,0);
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x[0] = 'a'; // expected-warning{{Use of memory after it is freed}}
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}
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void PR6123() {
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int *x = malloc(11); // expected-warning{{Cast a region whose size is not a multiple of the destination type size}}
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}
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void PR7217() {
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int *buf = malloc(2); // expected-warning{{Cast a region whose size is not a multiple of the destination type size}}
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buf[1] = 'c'; // not crash
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}
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void mallocCastToVoid() {
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void *p = malloc(2);
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const void *cp = p; // not crash
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free(p);
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}
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void mallocCastToFP() {
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void *p = malloc(2);
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void (*fp)() = p; // not crash
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free(p);
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}
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// This tests that malloc() buffers are undefined by default
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char mallocGarbage () {
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char *buf = malloc(2);
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char result = buf[1]; // expected-warning{{undefined}}
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free(buf);
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return result;
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}
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// This tests that calloc() buffers need to be freed
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void callocNoFree () {
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char *buf = calloc(2,2);
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return; // expected-warning{{Potential leak of memory pointed to by 'buf'}}
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}
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// These test that calloc() buffers are zeroed by default
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char callocZeroesGood () {
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char *buf = calloc(2,2);
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char result = buf[3]; // no-warning
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if (buf[1] == 0) {
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free(buf);
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}
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return result; // no-warning
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}
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char callocZeroesBad () {
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char *buf = calloc(2,2);
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char result = buf[3]; // no-warning
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if (buf[1] != 0) {
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free(buf); // expected-warning{{never executed}}
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}
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return result; // expected-warning{{Potential leak of memory pointed to by 'buf'}}
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}
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void nullFree() {
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int *p = 0;
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free(p); // no warning - a nop
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}
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void paramFree(int *p) {
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myfoo(p);
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free(p); // no warning
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myfoo(p); // expected-warning {{Use of memory after it is freed}}
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}
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int* mallocEscapeRet() {
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int *p = malloc(12);
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return p; // no warning
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}
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void mallocEscapeFoo() {
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int *p = malloc(12);
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myfoo(p);
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return; // no warning
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}
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void mallocEscapeFree() {
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int *p = malloc(12);
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myfoo(p);
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free(p);
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}
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void mallocEscapeFreeFree() {
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int *p = malloc(12);
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myfoo(p);
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free(p);
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free(p); // expected-warning{{Attempt to free released memory}}
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}
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void mallocEscapeFreeUse() {
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int *p = malloc(12);
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myfoo(p);
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free(p);
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myfoo(p); // expected-warning{{Use of memory after it is freed}}
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}
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int *myalloc();
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void myalloc2(int **p);
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void mallocEscapeFreeCustomAlloc() {
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int *p = malloc(12);
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myfoo(p);
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free(p);
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p = myalloc();
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free(p); // no warning
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}
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void mallocEscapeFreeCustomAlloc2() {
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int *p = malloc(12);
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myfoo(p);
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free(p);
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myalloc2(&p);
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free(p); // no warning
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}
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void mallocBindFreeUse() {
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int *x = malloc(12);
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int *y = x;
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free(y);
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myfoo(x); // expected-warning{{Use of memory after it is freed}}
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}
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void mallocEscapeMalloc() {
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int *p = malloc(12);
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myfoo(p);
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p = malloc(12);
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} // expected-warning{{Potential leak of memory pointed to by}}
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void mallocMalloc() {
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int *p = malloc(12);
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p = malloc(12);
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} // expected-warning {{Potential leak of memory pointed to by}}
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void mallocFreeMalloc() {
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int *p = malloc(12);
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free(p);
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p = malloc(12);
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free(p);
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}
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void mallocFreeUse_params() {
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int *p = malloc(12);
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free(p);
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myfoo(p); //expected-warning{{Use of memory after it is freed}}
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}
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void mallocFreeUse_params2() {
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int *p = malloc(12);
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free(p);
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myfooint(*p); //expected-warning{{Use of memory after it is freed}}
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}
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void mallocFailedOrNot() {
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int *p = malloc(12);
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if (!p)
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free(p);
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else
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free(p);
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}
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struct StructWithInt {
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int g;
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};
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int *mallocReturnFreed() {
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int *p = malloc(12);
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free(p);
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return p; // expected-warning {{Use of memory after it is freed}}
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}
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int useAfterFreeStruct() {
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struct StructWithInt *px= malloc(sizeof(struct StructWithInt));
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px->g = 5;
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free(px);
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return px->g; // expected-warning {{Use of memory after it is freed}}
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}
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void nonSymbolAsFirstArg(int *pp, struct StructWithInt *p);
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void mallocEscapeFooNonSymbolArg() {
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struct StructWithInt *p = malloc(sizeof(struct StructWithInt));
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nonSymbolAsFirstArg(&p->g, p);
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return; // no warning
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}
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void mallocFailedOrNotLeak() {
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int *p = malloc(12);
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if (p == 0)
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return; // no warning
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else
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return; // expected-warning {{Potential leak of memory pointed to by}}
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}
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void mallocAssignment() {
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char *p = malloc(12);
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p = fooRetPtr();
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} // expected-warning {{leak}}
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int vallocTest() {
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char *mem = valloc(12);
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return 0; // expected-warning {{Potential leak of memory pointed to by}}
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}
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void vallocEscapeFreeUse() {
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int *p = valloc(12);
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myfoo(p);
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free(p);
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myfoo(p); // expected-warning{{Use of memory after it is freed}}
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}
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int *Gl;
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struct GlStTy {
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int *x;
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};
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struct GlStTy GlS = {0};
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||
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||
void GlobalFree() {
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||
free(Gl);
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||
}
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void GlobalMalloc() {
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Gl = malloc(12);
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}
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void GlobalStructMalloc() {
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int *a = malloc(12);
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GlS.x = a;
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}
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void GlobalStructMallocFree() {
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int *a = malloc(12);
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GlS.x = a;
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free(GlS.x);
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||
}
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||
char *ArrayG[12];
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void globalArrayTest() {
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char *p = (char*)malloc(12);
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ArrayG[0] = p;
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}
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||
|
||
// Make sure that we properly handle a pointer stored into a local struct/array.
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||
typedef struct _StructWithPtr {
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||
int *memP;
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||
} StructWithPtr;
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||
|
||
static StructWithPtr arrOfStructs[10];
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||
|
||
void testMalloc() {
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int *x = malloc(12);
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StructWithPtr St;
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St.memP = x;
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arrOfStructs[0] = St; // no-warning
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||
}
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StructWithPtr testMalloc2() {
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||
int *x = malloc(12);
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||
StructWithPtr St;
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||
St.memP = x;
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||
return St; // no-warning
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||
}
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||
|
||
int *testMalloc3() {
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||
int *x = malloc(12);
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int *y = x;
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||
return y; // no-warning
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||
}
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||
|
||
void testStructLeak() {
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||
StructWithPtr St;
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||
St.memP = malloc(12);
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||
return; // expected-warning {{Potential leak of memory pointed to by 'St.memP'}}
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||
}
|
||
|
||
void testElemRegion1() {
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||
char *x = (void*)malloc(2);
|
||
int *ix = (int*)x;
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||
free(&(x[0]));
|
||
}
|
||
|
||
void testElemRegion2(int **pp) {
|
||
int *p = malloc(12);
|
||
*pp = p;
|
||
free(pp[0]);
|
||
}
|
||
|
||
void testElemRegion3(int **pp) {
|
||
int *p = malloc(12);
|
||
*pp = p;
|
||
free(*pp);
|
||
}
|
||
// Region escape testing.
|
||
|
||
unsigned takePtrToPtr(int **p);
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||
void PassTheAddrOfAllocatedData(int f) {
|
||
int *p = malloc(12);
|
||
// We don't know what happens after the call. Should stop tracking here.
|
||
if (takePtrToPtr(&p))
|
||
f++;
|
||
free(p); // no warning
|
||
}
|
||
|
||
struct X {
|
||
int *p;
|
||
};
|
||
unsigned takePtrToStruct(struct X *s);
|
||
int ** foo2(int *g, int f) {
|
||
int *p = malloc(12);
|
||
struct X *px= malloc(sizeof(struct X));
|
||
px->p = p;
|
||
// We don't know what happens after this call. Should not track px nor p.
|
||
if (takePtrToStruct(px))
|
||
f++;
|
||
free(p);
|
||
return 0;
|
||
}
|
||
|
||
struct X* RegInvalidationDetect1(struct X *s2) {
|
||
struct X *px= malloc(sizeof(struct X));
|
||
px->p = 0;
|
||
px = s2;
|
||
return px; // expected-warning {{Potential leak of memory pointed to by}}
|
||
}
|
||
|
||
struct X* RegInvalidationGiveUp1() {
|
||
int *p = malloc(12);
|
||
struct X *px= malloc(sizeof(struct X));
|
||
px->p = p;
|
||
return px;
|
||
}
|
||
|
||
int **RegInvalidationDetect2(int **pp) {
|
||
int *p = malloc(12);
|
||
pp = &p;
|
||
pp++;
|
||
return 0;// expected-warning {{Potential leak of memory pointed to by}}
|
||
}
|
||
|
||
extern void exit(int) __attribute__ ((__noreturn__));
|
||
void mallocExit(int *g) {
|
||
struct xx *p = malloc(12);
|
||
if (g != 0)
|
||
exit(1);
|
||
free(p);
|
||
return;
|
||
}
|
||
|
||
extern void __assert_fail (__const char *__assertion, __const char *__file,
|
||
unsigned int __line, __const char *__function)
|
||
__attribute__ ((__noreturn__));
|
||
#define assert(expr) \
|
||
((expr) ? (void)(0) : __assert_fail (#expr, __FILE__, __LINE__, __func__))
|
||
void mallocAssert(int *g) {
|
||
struct xx *p = malloc(12);
|
||
|
||
assert(g != 0);
|
||
free(p);
|
||
return;
|
||
}
|
||
|
||
void doNotInvalidateWhenPassedToSystemCalls(char *s) {
|
||
char *p = malloc(12);
|
||
strlen(p);
|
||
strcpy(p, s);
|
||
} // expected-warning {{leak}}
|
||
|
||
// Rely on the CString checker evaluation of the strcpy API to convey that the result of strcpy is equal to p.
|
||
void symbolLostWithStrcpy(char *s) {
|
||
char *p = malloc(12);
|
||
p = strcpy(p, s);
|
||
free(p);
|
||
}
|
||
|
||
|
||
// The same test as the one above, but with what is actually generated on a mac.
|
||
static __inline char *
|
||
__inline_strcpy_chk (char *restrict __dest, const char *restrict __src)
|
||
{
|
||
return __builtin___strcpy_chk (__dest, __src, __builtin_object_size (__dest, 2 > 1));
|
||
}
|
||
|
||
void symbolLostWithStrcpy_InlineStrcpyVersion(char *s) {
|
||
char *p = malloc(12);
|
||
p = ((__builtin_object_size (p, 0) != (size_t) -1) ? __builtin___strcpy_chk (p, s, __builtin_object_size (p, 2 > 1)) : __inline_strcpy_chk (p, s));
|
||
free(p);
|
||
}
|
||
|
||
// Here we are returning a pointer one past the allocated value. An idiom which
|
||
// can be used for implementing special malloc. The correct uses of this might
|
||
// be rare enough so that we could keep this as a warning.
|
||
static void *specialMalloc(int n){
|
||
int *p;
|
||
p = malloc( n+8 );
|
||
if( p ){
|
||
p[0] = n;
|
||
p++;
|
||
}
|
||
return p;
|
||
}
|
||
|
||
// Potentially, the user could free the struct by performing pointer arithmetic on the return value.
|
||
// This is a variation of the specialMalloc issue, though probably would be more rare in correct code.
|
||
int *specialMallocWithStruct() {
|
||
struct StructWithInt *px= malloc(sizeof(struct StructWithInt));
|
||
return &(px->g);
|
||
}
|
||
|
||
// Test various allocation/deallocation functions.
|
||
void testStrdup(const char *s, unsigned validIndex) {
|
||
char *s2 = strdup(s);
|
||
s2[validIndex + 1] = 'b';
|
||
} // expected-warning {{Potential leak of memory pointed to by}}
|
||
|
||
int testStrndup(const char *s, unsigned validIndex, unsigned size) {
|
||
char *s2 = strndup(s, size);
|
||
s2 [validIndex + 1] = 'b';
|
||
if (s2[validIndex] != 'a')
|
||
return 0;
|
||
else
|
||
return 1;// expected-warning {{Potential leak of memory pointed to by}}
|
||
}
|
||
|
||
void testStrdupContentIsDefined(const char *s, unsigned validIndex) {
|
||
char *s2 = strdup(s);
|
||
char result = s2[1];// no warning
|
||
free(s2);
|
||
}
|
||
|
||
// ----------------------------------------------------------------------------
|
||
// Test the system library functions to which the pointer can escape.
|
||
// This tests false positive suppression.
|
||
|
||
// For now, we assume memory passed to pthread_specific escapes.
|
||
// TODO: We could check that if a new pthread binding is set, the existing
|
||
// binding must be freed; otherwise, a memory leak can occur.
|
||
void testPthereadSpecificEscape(pthread_key_t key) {
|
||
void *buf = malloc(12);
|
||
pthread_setspecific(key, buf); // no warning
|
||
}
|
||
|
||
// PR12101: Test funopen().
|
||
static int releasePtr(void *_ctx) {
|
||
free(_ctx);
|
||
return 0;
|
||
}
|
||
FILE *useFunOpen() {
|
||
void *ctx = malloc(sizeof(int));
|
||
FILE *f = funopen(ctx, 0, 0, 0, releasePtr); // no warning
|
||
if (f == 0) {
|
||
free(ctx);
|
||
}
|
||
return f;
|
||
}
|
||
FILE *useFunOpenNoReleaseFunction() {
|
||
void *ctx = malloc(sizeof(int));
|
||
FILE *f = funopen(ctx, 0, 0, 0, 0);
|
||
if (f == 0) {
|
||
free(ctx);
|
||
}
|
||
return f; // expected-warning{{leak}}
|
||
}
|
||
|
||
static int readNothing(void *_ctx, char *buf, int size) {
|
||
return 0;
|
||
}
|
||
FILE *useFunOpenReadNoRelease() {
|
||
void *ctx = malloc(sizeof(int));
|
||
FILE *f = funopen(ctx, readNothing, 0, 0, 0);
|
||
if (f == 0) {
|
||
free(ctx);
|
||
}
|
||
return f; // expected-warning{{leak}}
|
||
}
|
||
|
||
// Test setbuf, setvbuf.
|
||
int my_main_no_warning() {
|
||
char *p = malloc(100);
|
||
setvbuf(stdout, p, 0, 100);
|
||
return 0;
|
||
}
|
||
int my_main_no_warning2() {
|
||
char *p = malloc(100);
|
||
setbuf(__stdoutp, p);
|
||
return 0;
|
||
}
|
||
int my_main_warn(FILE *f) {
|
||
char *p = malloc(100);
|
||
setvbuf(f, p, 0, 100);
|
||
return 0;// expected-warning {{leak}}
|
||
}
|
||
|
||
// <rdar://problem/10978247>.
|
||
// some people use stack allocated memory as an optimization to avoid
|
||
// a heap allocation for small work sizes. This tests the analyzer's
|
||
// understanding that the malloc'ed memory is not the same as stackBuffer.
|
||
void radar10978247(int myValueSize) {
|
||
char stackBuffer[128];
|
||
char *buffer;
|
||
|
||
if (myValueSize <= sizeof(stackBuffer))
|
||
buffer = stackBuffer;
|
||
else
|
||
buffer = malloc(myValueSize);
|
||
|
||
// do stuff with the buffer
|
||
if (buffer != stackBuffer)
|
||
free(buffer);
|
||
}
|
||
|
||
void radar10978247_positive(int myValueSize) {
|
||
char stackBuffer[128];
|
||
char *buffer;
|
||
|
||
if (myValueSize <= sizeof(stackBuffer))
|
||
buffer = stackBuffer;
|
||
else
|
||
buffer = malloc(myValueSize);
|
||
|
||
// do stuff with the buffer
|
||
if (buffer == stackBuffer)
|
||
return;
|
||
else
|
||
return; // expected-warning {{leak}}
|
||
}
|
||
// <rdar://problem/11269741> Previously this triggered a false positive
|
||
// because malloc() is known to return uninitialized memory and the binding
|
||
// of 'o' to 'p->n' was not getting propertly handled. Now we report a leak.
|
||
struct rdar11269741_a_t {
|
||
struct rdar11269741_b_t {
|
||
int m;
|
||
} n;
|
||
};
|
||
|
||
int rdar11269741(struct rdar11269741_b_t o)
|
||
{
|
||
struct rdar11269741_a_t *p = (struct rdar11269741_a_t *) malloc(sizeof(*p));
|
||
p->n = o;
|
||
return p->n.m; // expected-warning {{leak}}
|
||
}
|
||
|
||
// Pointer arithmetic, returning an ElementRegion.
|
||
void *radar11329382(unsigned bl) {
|
||
void *ptr = malloc (16);
|
||
ptr = ptr + (2 - bl);
|
||
return ptr; // no warning
|
||
}
|
||
|
||
void __assert_rtn(const char *, const char *, int, const char *) __attribute__((__noreturn__));
|
||
int strcmp(const char *, const char *);
|
||
char *a (void);
|
||
void radar11270219(void) {
|
||
char *x = a(), *y = a();
|
||
(__builtin_expect(!(x && y), 0) ? __assert_rtn(__func__, "/Users/zaks/tmp/ex.c", 24, "x && y") : (void)0);
|
||
strcmp(x, y); // no warning
|
||
}
|
||
|
||
void radar_11358224_test_double_assign_ints_positive_2()
|
||
{
|
||
void *ptr = malloc(16);
|
||
ptr = ptr;
|
||
} // expected-warning {{leak}}
|
||
|
||
// Assume that functions which take a function pointer can free memory even if
|
||
// they are defined in system headers and take the const pointer to the
|
||
// allocated memory. (radar://11160612)
|
||
int const_ptr_and_callback(int, const char*, int n, void(*)(void*));
|
||
void r11160612_1() {
|
||
char *x = malloc(12);
|
||
const_ptr_and_callback(0, x, 12, free); // no - warning
|
||
}
|
||
|
||
// Null is passed as callback.
|
||
void r11160612_2() {
|
||
char *x = malloc(12);
|
||
const_ptr_and_callback(0, x, 12, 0);
|
||
} // expected-warning {{leak}}
|
||
|
||
// Callback is passed to a function defined in a system header.
|
||
void r11160612_4() {
|
||
char *x = malloc(12);
|
||
sqlite3_bind_text_my(0, x, 12, free); // no - warning
|
||
}
|
||
|
||
// Passing callbacks in a struct.
|
||
void r11160612_5(StWithCallback St) {
|
||
void *x = malloc(12);
|
||
dealocateMemWhenDoneByVal(x, St);
|
||
}
|
||
void r11160612_6(StWithCallback St) {
|
||
void *x = malloc(12);
|
||
dealocateMemWhenDoneByRef(&St, x);
|
||
}
|
||
|
||
int mySub(int, int);
|
||
int myAdd(int, int);
|
||
int fPtr(unsigned cond, int x) {
|
||
return (cond ? mySub : myAdd)(x, x);
|
||
}
|
||
|
||
// Test anti-aliasing.
|
||
|
||
void dependsOnValueOfPtr(int *g, unsigned f) {
|
||
int *p;
|
||
|
||
if (f) {
|
||
p = g;
|
||
} else {
|
||
p = malloc(12);
|
||
}
|
||
|
||
if (p != g)
|
||
free(p);
|
||
else
|
||
return; // no warning
|
||
return;
|
||
}
|
||
|
||
int CMPRegionHeapToStack() {
|
||
int x = 0;
|
||
int *x1 = malloc(8);
|
||
int *x2 = &x;
|
||
clang_analyzer_eval(x1 == x2); // expected-warning{{FALSE}}
|
||
free(x1);
|
||
return x;
|
||
}
|
||
|
||
int CMPRegionHeapToHeap2() {
|
||
int x = 0;
|
||
int *x1 = malloc(8);
|
||
int *x2 = malloc(8);
|
||
int *x4 = x1;
|
||
int *x5 = x2;
|
||
clang_analyzer_eval(x4 == x5); // expected-warning{{FALSE}}
|
||
free(x1);
|
||
free(x2);
|
||
return x;
|
||
}
|
||
|
||
int CMPRegionHeapToHeap() {
|
||
int x = 0;
|
||
int *x1 = malloc(8);
|
||
int *x4 = x1;
|
||
if (x1 == x4) {
|
||
free(x1);
|
||
return 5/x; // expected-warning{{Division by zero}}
|
||
}
|
||
return x;// expected-warning{{This statement is never executed}}
|
||
}
|
||
|
||
int HeapAssignment() {
|
||
int m = 0;
|
||
int *x = malloc(4);
|
||
int *y = x;
|
||
*x = 5;
|
||
clang_analyzer_eval(*x != *y); // expected-warning{{FALSE}}
|
||
free(x);
|
||
return 0;
|
||
}
|
||
|
||
int *retPtr();
|
||
int *retPtrMightAlias(int *x);
|
||
int cmpHeapAllocationToUnknown() {
|
||
int zero = 0;
|
||
int *yBefore = retPtr();
|
||
int *m = malloc(8);
|
||
int *yAfter = retPtrMightAlias(m);
|
||
clang_analyzer_eval(yBefore == m); // expected-warning{{FALSE}}
|
||
clang_analyzer_eval(yAfter == m); // expected-warning{{FALSE}}
|
||
free(m);
|
||
return 0;
|
||
}
|
||
|
||
void localArrayTest() {
|
||
char *p = (char*)malloc(12);
|
||
char *ArrayL[12];
|
||
ArrayL[0] = p;
|
||
} // expected-warning {{leak}}
|
||
|
||
void localStructTest() {
|
||
StructWithPtr St;
|
||
StructWithPtr *pSt = &St;
|
||
pSt->memP = malloc(12);
|
||
} // expected-warning{{Potential leak of memory pointed to by}}
|
||
|
||
#ifdef __INTPTR_TYPE__
|
||
// Test double assignment through integers.
|
||
typedef __INTPTR_TYPE__ intptr_t;
|
||
typedef unsigned __INTPTR_TYPE__ uintptr_t;
|
||
|
||
static intptr_t glob;
|
||
void test_double_assign_ints()
|
||
{
|
||
void *ptr = malloc (16); // no-warning
|
||
glob = (intptr_t)(uintptr_t)ptr;
|
||
}
|
||
|
||
void test_double_assign_ints_positive()
|
||
{
|
||
void *ptr = malloc(16);
|
||
(void*)(intptr_t)(uintptr_t)ptr; // expected-warning {{unused}}
|
||
} // expected-warning {{leak}}
|
||
#endif
|
||
|
||
void testCGContextNoLeak()
|
||
{
|
||
void *ptr = malloc(16);
|
||
CGContextRef context = CGBitmapContextCreate(ptr);
|
||
|
||
// Because you can get the data back out like this, even much later,
|
||
// CGBitmapContextCreate is one of our "stop-tracking" exceptions.
|
||
free(CGBitmapContextGetData(context));
|
||
}
|
||
|
||
void testCGContextLeak()
|
||
{
|
||
void *ptr = malloc(16);
|
||
CGContextRef context = CGBitmapContextCreate(ptr);
|
||
// However, this time we're just leaking the data, because the context
|
||
// object doesn't escape and it hasn't been freed in this function.
|
||
}
|
||
|
||
// Allow xpc context to escape. radar://11635258
|
||
// TODO: Would be great if we checked that the finalize_connection_context actually releases it.
|
||
static void finalize_connection_context(void *ctx) {
|
||
int *context = ctx;
|
||
free(context);
|
||
}
|
||
void foo (xpc_connection_t peer) {
|
||
int *ctx = calloc(1, sizeof(int));
|
||
xpc_connection_set_context(peer, ctx);
|
||
xpc_connection_set_finalizer_f(peer, finalize_connection_context);
|
||
xpc_connection_resume(peer);
|
||
}
|
||
|
||
// Make sure we catch errors when we free in a function which does not allocate memory.
|
||
void freeButNoMalloc(int *p, int x){
|
||
if (x) {
|
||
free(p);
|
||
//user forgot a return here.
|
||
}
|
||
free(p); // expected-warning {{Attempt to free released memory}}
|
||
}
|
||
|
||
struct HasPtr {
|
||
char *p;
|
||
};
|
||
|
||
char* reallocButNoMalloc(struct HasPtr *a, int c, int size) {
|
||
int *s;
|
||
char *b = realloc(a->p, size);
|
||
char *m = realloc(a->p, size); // expected-warning {{Attempt to free released memory}}
|
||
return a->p;
|
||
}
|
||
|
||
// We should not warn in this case since the caller will presumably free a->p in all cases.
|
||
int reallocButNoMallocPR13674(struct HasPtr *a, int c, int size) {
|
||
int *s;
|
||
char *b = realloc(a->p, size);
|
||
if (b == 0)
|
||
return -1;
|
||
a->p = b;
|
||
return 0;
|
||
}
|
||
|
||
// Test realloc with no visible malloc.
|
||
void *test(void *ptr) {
|
||
void *newPtr = realloc(ptr, 4);
|
||
if (newPtr == 0) {
|
||
if (ptr)
|
||
free(ptr); // no-warning
|
||
}
|
||
return newPtr;
|
||
}
|
||
|
||
|
||
char *testLeakWithinReturn(char *str) {
|
||
return strdup(strdup(str)); // expected-warning{{leak}}
|
||
}
|
||
|
||
void passConstPtr(const char * ptr);
|
||
|
||
void testPassConstPointer() {
|
||
char * string = malloc(sizeof(char)*10);
|
||
passConstPtr(string);
|
||
return; // expected-warning {{leak}}
|
||
}
|
||
|
||
void testPassConstPointerIndirectly() {
|
||
char *p = malloc(1);
|
||
p++;
|
||
memcmp(p, p, sizeof(&p));
|
||
return; // expected-warning {{leak}}
|
||
}
|
||
|
||
void testPassConstPointerIndirectlyStruct() {
|
||
struct HasPtr hp;
|
||
hp.p = malloc(10);
|
||
memcmp(&hp, &hp, sizeof(hp));
|
||
return; // expected-warning {{Potential leak of memory pointed to by 'hp.p'}}
|
||
}
|
||
|
||
void testPassToSystemHeaderFunctionIndirectlyStruct() {
|
||
SomeStruct ss;
|
||
ss.p = malloc(1);
|
||
fakeSystemHeaderCall(&ss); // invalidates ss, making ss.p unreachable
|
||
// Technically a false negative here -- we know the system function won't free
|
||
// ss.p, but nothing else will either!
|
||
} // no-warning
|
||
|
||
void testPassToSystemHeaderFunctionIndirectlyStructFree() {
|
||
SomeStruct ss;
|
||
ss.p = malloc(1);
|
||
fakeSystemHeaderCall(&ss); // invalidates ss, making ss.p unreachable
|
||
free(ss.p);
|
||
} // no-warning
|
||
|
||
void testPassToSystemHeaderFunctionIndirectlyArray() {
|
||
int *p[1];
|
||
p[0] = malloc(sizeof(int));
|
||
fakeSystemHeaderCallIntPtr(p); // invalidates p, making p[0] unreachable
|
||
// Technically a false negative here -- we know the system function won't free
|
||
// p[0], but nothing else will either!
|
||
} // no-warning
|
||
|
||
void testPassToSystemHeaderFunctionIndirectlyArrayFree() {
|
||
int *p[1];
|
||
p[0] = malloc(sizeof(int));
|
||
fakeSystemHeaderCallIntPtr(p); // invalidates p, making p[0] unreachable
|
||
free(p[0]);
|
||
} // no-warning
|
||
|
||
int *testOffsetAllocate(size_t size) {
|
||
int *memoryBlock = (int *)malloc(size + sizeof(int));
|
||
return &memoryBlock[1]; // no-warning
|
||
}
|
||
|
||
void testOffsetDeallocate(int *memoryBlock) {
|
||
free(&memoryBlock[-1]); // no-warning
|
||
}
|
||
|
||
void testOffsetOfRegionFreed() {
|
||
__int64_t * array = malloc(sizeof(__int64_t)*2);
|
||
array += 1;
|
||
free(&array[0]); // expected-warning{{Argument to free() is offset by 8 bytes from the start of memory allocated by malloc()}}
|
||
}
|
||
|
||
void testOffsetOfRegionFreed2() {
|
||
__int64_t *p = malloc(sizeof(__int64_t)*2);
|
||
p += 1;
|
||
free(p); // expected-warning{{Argument to free() is offset by 8 bytes from the start of memory allocated by malloc()}}
|
||
}
|
||
|
||
void testOffsetOfRegionFreed3() {
|
||
char *r = malloc(sizeof(char));
|
||
r = r - 10;
|
||
free(r); // expected-warning {{Argument to free() is offset by -10 bytes from the start of memory allocated by malloc()}}
|
||
}
|
||
|
||
void testOffsetOfRegionFreedAfterFunctionCall() {
|
||
int *p = malloc(sizeof(int)*2);
|
||
p += 1;
|
||
myfoo(p);
|
||
free(p); // expected-warning{{Argument to free() is offset by 4 bytes from the start of memory allocated by malloc()}}
|
||
}
|
||
|
||
void testFixManipulatedPointerBeforeFree() {
|
||
int * array = malloc(sizeof(int)*2);
|
||
array += 1;
|
||
free(&array[-1]); // no-warning
|
||
}
|
||
|
||
void testFixManipulatedPointerBeforeFree2() {
|
||
char *r = malloc(sizeof(char));
|
||
r = r + 10;
|
||
free(r-10); // no-warning
|
||
}
|
||
|
||
void freeOffsetPointerPassedToFunction() {
|
||
__int64_t *p = malloc(sizeof(__int64_t)*2);
|
||
p[1] = 0;
|
||
p += 1;
|
||
myfooint(*p); // not passing the pointer, only a value pointed by pointer
|
||
free(p); // expected-warning {{Argument to free() is offset by 8 bytes from the start of memory allocated by malloc()}}
|
||
}
|
||
|
||
int arbitraryInt();
|
||
void freeUnknownOffsetPointer() {
|
||
char *r = malloc(sizeof(char));
|
||
r = r + arbitraryInt(); // unable to reason about what the offset might be
|
||
free(r); // no-warning
|
||
}
|
||
|
||
void testFreeNonMallocPointerWithNoOffset() {
|
||
char c;
|
||
char *r = &c;
|
||
r = r + 10;
|
||
free(r-10); // expected-warning {{Argument to free() is the address of the local variable 'c', which is not memory allocated by malloc()}}
|
||
}
|
||
|
||
void testFreeNonMallocPointerWithOffset() {
|
||
char c;
|
||
char *r = &c;
|
||
free(r+1); // expected-warning {{Argument to free() is the address of the local variable 'c', which is not memory allocated by malloc()}}
|
||
}
|
||
|
||
void testOffsetZeroDoubleFree() {
|
||
int *array = malloc(sizeof(int)*2);
|
||
int *p = &array[0];
|
||
free(p);
|
||
free(&array[0]); // expected-warning{{Attempt to free released memory}}
|
||
}
|
||
|
||
void testOffsetPassedToStrlen() {
|
||
char * string = malloc(sizeof(char)*10);
|
||
string += 1;
|
||
int length = strlen(string); // expected-warning {{Potential leak of memory pointed to by 'string'}}
|
||
}
|
||
|
||
void testOffsetPassedToStrlenThenFree() {
|
||
char * string = malloc(sizeof(char)*10);
|
||
string += 1;
|
||
int length = strlen(string);
|
||
free(string); // expected-warning {{Argument to free() is offset by 1 byte from the start of memory allocated by malloc()}}
|
||
}
|
||
|
||
void testOffsetPassedAsConst() {
|
||
char * string = malloc(sizeof(char)*10);
|
||
string += 1;
|
||
passConstPtr(string);
|
||
free(string); // expected-warning {{Argument to free() is offset by 1 byte from the start of memory allocated by malloc()}}
|
||
}
|
||
|
||
char **_vectorSegments;
|
||
int _nVectorSegments;
|
||
|
||
void poolFreeC(void* s) {
|
||
free(s); // no-warning
|
||
}
|
||
void freeMemory() {
|
||
while (_nVectorSegments) {
|
||
poolFreeC(_vectorSegments[_nVectorSegments++]);
|
||
}
|
||
}
|
||
|
||
// ----------------------------------------------------------------------------
|
||
// False negatives.
|
||
|
||
void testMallocWithParam(int **p) {
|
||
*p = (int*) malloc(sizeof(int));
|
||
*p = 0; // FIXME: should warn here
|
||
}
|
||
|
||
void testMallocWithParam_2(int **p) {
|
||
*p = (int*) malloc(sizeof(int)); // no-warning
|
||
}
|
||
|
||
void testPassToSystemHeaderFunctionIndirectly() {
|
||
int *p = malloc(4);
|
||
p++;
|
||
fakeSystemHeaderCallInt(p);
|
||
// FIXME: This is a leak: if we think a system function won't free p, it
|
||
// won't free (p-1) either.
|
||
}
|