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Vasiliy Kovalev f749ba7d39 hfs/hfsplus: fix slab-out-of-bounds in hfs_bnode_read_key 
commit bb5e07cb92 upstream.

Syzbot reported an issue in hfs subsystem:

BUG: KASAN: slab-out-of-bounds in memcpy_from_page include/linux/highmem.h:423 [inline]
BUG: KASAN: slab-out-of-bounds in hfs_bnode_read fs/hfs/bnode.c:35 [inline]
BUG: KASAN: slab-out-of-bounds in hfs_bnode_read_key+0x314/0x450 fs/hfs/bnode.c:70
Write of size 94 at addr ffff8880123cd100 by task syz-executor237/5102

Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
 memcpy_from_page include/linux/highmem.h:423 [inline]
 hfs_bnode_read fs/hfs/bnode.c:35 [inline]
 hfs_bnode_read_key+0x314/0x450 fs/hfs/bnode.c:70
 hfs_brec_insert+0x7f3/0xbd0 fs/hfs/brec.c:159
 hfs_cat_create+0x41d/0xa50 fs/hfs/catalog.c:118
 hfs_mkdir+0x6c/0xe0 fs/hfs/dir.c:232
 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4257
 do_mkdirat+0x264/0x3a0 fs/namei.c:4280
 __do_sys_mkdir fs/namei.c:4300 [inline]
 __se_sys_mkdir fs/namei.c:4298 [inline]
 __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4298
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbdd6057a99

Add a check for key length in hfs_bnode_read_key to prevent
out-of-bounds memory access. If the key length is invalid, the
key buffer is cleared, improving stability and reliability.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-by: syzbot+5f3a973ed3dfb85a6683@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=5f3a973ed3dfb85a6683
Cc: stable@vger.kernel.org
Signed-off-by: Vasiliy Kovalev <kovalev@altlinux.org>
Link: https://lore.kernel.org/20241019191303.24048-1-kovalev@altlinux.org
Reviewed-by: Cengiz Can <cengiz.can@canonical.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 9f77aa584a659b21211a794e53522e6fb16d4a16)
 		2025-05-09 22:54:46 +08:00
..
Kconfig fs: add CONFIG_BUFFER_HEAD 2023-08-02 09:13:09 -06:00
Makefile
…
attributes.c
…
bfind.c hfsplus: fix to avoid false alarm of circular locking 2024-12-10 20:39:35 +08:00
bitmap.c hfsplus: convert kmap() to kmap_local_page() in bitmap.c 2022-09-11 21:55:04 -07:00
bnode.c hfs/hfsplus: fix slab-out-of-bounds in hfs_bnode_read_key 2025-05-09 22:54:46 +08:00
brec.c
…
btree.c hfsplus: convert kmap() to kmap_local_page() in btree.c 2022-09-11 21:55:05 -07:00
catalog.c hfsplus: convert to ctime accessor functions 2023-07-24 10:30:00 +02:00
dir.c hfsplus: convert to ctime accessor functions 2023-07-24 10:30:00 +02:00
extents.c hfsplus: fix to avoid false alarm of circular locking 2024-12-10 20:39:35 +08:00
hfsplus_fs.h hfsplus: don't query the device logical block size multiple times 2024-12-10 20:44:25 +08:00
hfsplus_raw.h hfsplus: use struct_group_attr() for memcpy() region 2022-01-20 08:52:54 +02:00
inode.c fs: pass the request_mask to generic_fillattr 2023-08-09 08:56:36 +02:00
ioctl.c hfsplus: convert to fileattr 2021-04-12 15:04:29 +02:00
options.c hfsplus: fix bug causing custom uid and gid being unable to be assigned with mount 2022-12-11 19:30:20 -08:00
part_tbl.c fs/hfsplus: Use the enum req_op and blk_opf_t types 2022-07-14 12:14:32 -06:00
super.c fs: hfsplus: fix UAF issue in hfsplus_put_super 2023-03-02 21:54:23 -08:00
tables.c
…
unicode.c
…
wrapper.c hfsplus: don't query the device logical block size multiple times 2024-12-10 20:44:25 +08:00
xattr.c hfsplus: fix uninit-value in copy_name 2024-12-10 20:39:33 +08:00
xattr.h
…
xattr_security.c fs: port xattr to mnt_idmap 2023-01-19 09:24:28 +01:00
xattr_trusted.c fs: port xattr to mnt_idmap 2023-01-19 09:24:28 +01:00
xattr_user.c fs: port xattr to mnt_idmap 2023-01-19 09:24:28 +01:00