[syzbot] [udf?] KMSAN: uninit-value in udf_get_fileshortad

[syzbot] [udf?] KMSAN: uninit-value in udf_get_fileshortad

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    0babf683783d Merge tag 'pinctrl-v6.11-4' of git://git.kern..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=17139900580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ea008021530b2de3
dashboard link: https://syzkaller.appspot.com/bug?extid=8901c4560b7ab5c2f9df
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14080c9f980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13927c77980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a92580d12355/disk-0babf683.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8c7829a87d5b/vmlinux-0babf683.xz
kernel image: https://storage.googleapis.com/syzbot-assets/52de69e62dfd/bzImage-0babf683.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/e314f05a944a/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8901c4560b7ab5c2f9df@syzkaller.appspotmail.com

loop0: detected capacity change from 2048 to 2047
=====================================================
BUG: KMSAN: uninit-value in udf_get_fileshortad+0x174/0x1c0 fs/udf/directory.c:504
 udf_get_fileshortad+0x174/0x1c0 fs/udf/directory.c:504
 udf_current_aext+0x6cb/0x950 fs/udf/inode.c:2225
 udf_next_aext+0x94/0x500 fs/udf/inode.c:2171
 udf_discard_prealloc+0x47c/0x830 fs/udf/truncate.c:135
 udf_release_file+0xfd/0x160 fs/udf/file.c:184
 __fput+0x344/0x1160 fs/file_table.c:422
 __fput_sync+0x74/0x90 fs/file_table.c:507
 __do_sys_close fs/open.c:1566 [inline]
 __se_sys_close+0x290/0x4d0 fs/open.c:1551
 __x64_sys_close+0x48/0x60 fs/open.c:1551
 x64_sys_call+0x2c26/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:4
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 __alloc_pages_noprof+0x9d6/0xe70 mm/page_alloc.c:4725
 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2263
 alloc_pages_noprof mm/mempolicy.c:2343 [inline]
 folio_alloc_noprof+0x1db/0x310 mm/mempolicy.c:2350
 filemap_alloc_folio_noprof+0xa6/0x440 mm/filemap.c:1008
 __filemap_get_folio+0xa05/0x14b0 mm/filemap.c:1950
 grow_dev_folio fs/buffer.c:1047 [inline]
 grow_buffers fs/buffer.c:1113 [inline]
 __getblk_slow fs/buffer.c:1139 [inline]
 bdev_getblk+0x2c9/0xab0 fs/buffer.c:1441
 __bread_gfp+0x93/0x730 fs/buffer.c:1495
 sb_bread include/linux/buffer_head.h:347 [inline]
 udf_next_aext+0x302/0x500 fs/udf/inode.c:2186
 udf_discard_prealloc+0x47c/0x830 fs/udf/truncate.c:135
 udf_release_file+0xfd/0x160 fs/udf/file.c:184
 __fput+0x344/0x1160 fs/file_table.c:422
 __fput_sync+0x74/0x90 fs/file_table.c:507
 __do_sys_close fs/open.c:1566 [inline]
 __se_sys_close+0x290/0x4d0 fs/open.c:1551
 __x64_sys_close+0x48/0x60 fs/open.c:1551
 x64_sys_call+0x2c26/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:4
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 UID: 0 PID: 5181 Comm: syz-executor248 Not tainted 6.11.0-rc7-syzkaller-00149-g0babf683783d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
=====================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Re: [syzbot] [udf?] KMSAN: uninit-value in udf_get_fileshortad

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+8901c4560b7ab5c2f9df@syzkaller.appspotmail.com
Tested-by: syzbot+8901c4560b7ab5c2f9df@syzkaller.appspotmail.com

Tested on:

commit:         2004cef1 Merge tag 'sched-core-2024-09-19' of git://gi..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=133ab69f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ea86c03799707382
dashboard link: https://syzkaller.appspot.com/bug?extid=8901c4560b7ab5c2f9df
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=104d3b00580000

Note: testing is done by a robot and is best-effort only.

Re: [syzbot] [udf?] KMSAN: uninit-value in udf_get_fileshortad

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+8901c4560b7ab5c2f9df@syzkaller.appspotmail.com
Tested-by: syzbot+8901c4560b7ab5c2f9df@syzkaller.appspotmail.com

Tested on:

commit:         abf2050f Merge tag 'media/v6.12-1' of git://git.kernel..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10242227980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b430e3226f77df37
dashboard link: https://syzkaller.appspot.com/bug?extid=8901c4560b7ab5c2f9df
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=126f3107980000

Note: testing is done by a robot and is best-effort only.