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audit: fix potential double free on error path from fsnotify_add_inode_mark 

ANBZ: #9547

commit ad982c3be4 upstream.

Audit_alloc_mark() assign pathname to audit_mark->path, on error path
from fsnotify_add_inode_mark(), fsnotify_put_mark will free memory
of audit_mark->path, but the caller of audit_alloc_mark will free
the pathname again, so there will be double free problem.

Fix this by resetting audit_mark->path to NULL pointer on error path
from fsnotify_add_inode_mark().

Cc: stable@vger.kernel.org
Fixes: 7b12932340 ("fsnotify: Add group pointer in fsnotify_init_mark()")
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: YiLin.Li <YiLin.Li@linux.alibaba.com>
Reviewed-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Link: https://gitee.com/anolis/cloud-kernel/pulls/3511
This commit is contained in:
Gaosheng Cui 2022-08-22 10:29:05 +08:00 committed by 小龙
parent f63fad409f
commit 3bc6a54f69
1 changed files with 1 additions and 0 deletions
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1
kernel/audit_fsnotify.c
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@ -102,6 +102,7 @@ struct audit_fsnotify_mark *audit_alloc_mark(struct audit_krule *krule, char *pa
ret = fsnotify_add_inode_mark(&audit_mark->mark, inode, true);
if (ret < 0) {
audit_mark->path = NULL;
fsnotify_put_mark(&audit_mark->mark);
audit_mark = ERR_PTR(ret);
}