[syzbot] [squashfs?] VFS: Close: file count is zero (use-after-free)

syzbot
2024-06-02T15:20:27Z

Hello,

syzbot found the following issue on:

HEAD commit: 0e1980c40b6e Add linux-next specific files for 20240531
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13ac4616980000
kernel config: https://syzkaller.appspot.com/x/.config?x=d9c3ca4e54577b88
dashboard link: https://syzkaller.appspot.com/bug?extid=b2cfdac9ae5278d4b621
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=17f01564980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14484aba980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/44fb1d8b5978/disk-0e1980c4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a66ce5caf0b2/vmlinux-0e1980c4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8992fc8fe046/bzImage-0e1980c4.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/8530480d64fb/mount_0.gz

The issue was bisected to:

commit 344a1d8575b05298d0702a9f9231e57db86a855e
Author: Vivek Kasireddy <vivek.kasireddy@intel.com>
Date: Thu Apr 11 06:59:42 2024 +0000

udmabuf: convert udmabuf driver to use folios

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=153a7026980000
final oops: https://syzkaller.appspot.com/x/report.txt?x=173a7026980000
console output: https://syzkaller.appspot.com/x/log.txt?x=133a7026980000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b2cfdac9ae5278d4b621@syzkaller.appspotmail.com
Fixes: 344a1d8575b0 ("udmabuf: convert udmabuf driver to use folios")

VFS: Close: file count is 0 (f_op=shmem_file_operations)
------------[ cut here ]------------
kernel BUG at fs/open.c:1514!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 PID: 5089 Comm: syz-executor317 Not tainted 6.10.0-rc1-next-20240531-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:filp_flush+0x152/0x160 fs/open.c:1512
Code: e9 80 e1 07 80 c1 03 38 c1 7c a6 48 89 ef e8 c5 03 f0 ff eb 9c e8 6e 16 8a ff 48 c7 c7 20 59 d8 8b 48 89 ee e8 6f 84 7d 09 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900033bfc80 EFLAGS: 00010246
RAX: 0000000000000038 RBX: 0000000000000000 RCX: fe0d96255f7cdc00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffffff8bd42dc0 R08: ffffffff8176b129 R09: 1ffff92000677f2c
R10: dffffc0000000000 R11: fffff52000677f2d R12: ffff8880784d9680
R13: dffffc0000000000 R14: ffff88807aa761c0 R15: 0000000000000009
FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000003f3be538 CR3: 000000007f062000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
filp_close+0x1e/0x40 fs/open.c:1532
close_files fs/file.c:437 [inline]
put_files_struct+0x1b6/0x360 fs/file.c:452
do_exit+0xa08/0x28e0 kernel/exit.c:869
do_group_exit+0x207/0x2c0 kernel/exit.c:1023
__do_sys_exit_group kernel/exit.c:1034 [inline]
__se_sys_exit_group kernel/exit.c:1032 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1032
x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232
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: 0033:0x7fc324e0fd09
Code: Unable to access opcode bytes at 0x7fc324e0fcdf.
RSP: 002b:00007fffe9a711b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc324e0fd09
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 00007fc324e8b2d0 R08: ffffffffffffffb8 R09: 0000555580c204c0
R10: 0000555580c204c0 R11: 0000000000000246 R12: 00007fc324e8b2d0
R13: 0000000000000000 R14: 00007fc324e8c040 R15: 00007fc324dddf00
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:filp_flush+0x152/0x160 fs/open.c:1512
Code: e9 80 e1 07 80 c1 03 38 c1 7c a6 48 89 ef e8 c5 03 f0 ff eb 9c e8 6e 16 8a ff 48 c7 c7 20 59 d8 8b 48 89 ee e8 6f 84 7d 09 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900033bfc80 EFLAGS: 00010246
RAX: 0000000000000038 RBX: 0000000000000000 RCX: fe0d96255f7cdc00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffffff8bd42dc0 R08: ffffffff8176b129 R09: 1ffff92000677f2c
R10: dffffc0000000000 R11: fffff52000677f2d R12: ffff8880784d9680
R13: dffffc0000000000 R14: ffff88807aa761c0 R15: 0000000000000009
FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000003f3be538 CR3: 000000007f062000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

---
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