[v6.1] UBSAN: shift-out-of-bounds in das16m1_attach

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3369c6df2fae Linux 6.1.146
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=103e1f22580000
kernel config: https://syzkaller.appspot.com/x/.config?x=23408fa0371522c8
dashboard link: https://syzkaller.appspot.com/bug?extid=5a587a1214efc07e4fb0
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ffd1a897d15e/disk-3369c6df.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3901d2261137/vmlinux-3369c6df.xz
kernel image: https://storage.googleapis.com/syzbot-assets/dc1910a86639/bzImage-3369c6df.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5a587a...@syzkaller.appspotmail.com

================================================================================
UBSAN: shift-out-of-bounds in drivers/comedi/drivers/das16m1.c:525:9
shift exponent 159 is too large for 32-bit type 'int'
CPU: 0 PID: 4641 Comm: syz.3.63 Not tainted 6.1.146-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
ubsan_epilogue+0xa/0x30 lib/ubsan.c:151
__ubsan_handle_shift_out_of_bounds+0x37c/0x400 lib/ubsan.c:321
das16m1_attach+0x8c9/0xb00 drivers/comedi/drivers/das16m1.c:525
comedi_device_attach+0x515/0x650 drivers/comedi/drivers.c:995
do_devconfig_ioctl drivers/comedi/comedi_fops.c:851 [inline]
comedi_unlocked_ioctl+0x5ec/0xe90 drivers/comedi/comedi_fops.c:2131
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f03a5d8e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f03a6c9e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f03a5fb5fa0 RCX: 00007f03a5d8e9a9
RDX: 0000200000000180 RSI: 0000000040946400 RDI: 0000000000000003
RBP: 00007f03a5e10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f03a5fb5fa0 R15: 00007ffd630bca68
</TASK>
================================================================================


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

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: d96eb99e2f0e Linux 6.6.99
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15dccfd4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=bfd82343ac39d3b
dashboard link: https://syzkaller.appspot.com/bug?extid=a2c28845f45d1b1ebc79

compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:

disk image: https://storage.googleapis.com/syzbot-assets/11b332f11d00/disk-d96eb99e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8a063193b98f/vmlinux-d96eb99e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b36214b822e5/bzImage-d96eb99e.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:

Reported-by: syzbot+a2c288...@syzkaller.appspotmail.com

================================================================================
UBSAN: shift-out-of-bounds in drivers/comedi/drivers/das16m1.c:525:9
shift exponent 159 is too large for 32-bit type 'int'

CPU: 0 PID: 6759 Comm: syz.2.231 Not tainted 6.6.99-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>

dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
ubsan_epilogue+0xa/0x30 lib/ubsan.c:217
__ubsan_handle_shift_out_of_bounds+0x380/0x400 lib/ubsan.c:387
das16m1_attach+0x8cd/0xb00 drivers/comedi/drivers/das16m1.c:525
comedi_device_attach+0x519/0x660 drivers/comedi/drivers.c:995
do_devconfig_ioctl drivers/comedi/comedi_fops.c:855 [inline]
comedi_unlocked_ioctl+0x68d/0xf00 drivers/comedi/comedi_fops.c:2136
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9efc98e9a9

Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48

RSP: 002b:00007f9efc7ff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9efcbb5fa0 RCX: 00007f9efc98e9a9

RDX: 0000200000000180 RSI: 0000000040946400 RDI: 0000000000000003

RBP: 00007f9efca10d69 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000

R13: 0000000000000000 R14: 00007f9efcbb5fa0 R15: 00007fffbcd6d958

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: c79648372d02 Linux 5.15.189
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12237fd4580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f3b1215b3cf4119f
dashboard link: https://syzkaller.appspot.com/bug?extid=4c88a95fb2b380b49504

compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:

disk image: https://storage.googleapis.com/syzbot-assets/fa511d2a8893/disk-c7964837.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f14b6c77bbb9/vmlinux-c7964837.xz
kernel image: https://storage.googleapis.com/syzbot-assets/388987ba15c6/bzImage-c7964837.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:

Reported-by: syzbot+4c88a9...@syzkaller.appspotmail.com

================================================================================
UBSAN: shift-out-of-bounds in drivers/comedi/drivers/das16m1.c:526:9
shift exponent 9574 is too large for 32-bit type 'int'
CPU: 1 PID: 4908 Comm: syz.3.142 Not tainted 5.15.189-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>

dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106

ubsan_epilogue+0xa/0x30 lib/ubsan.c:151
__ubsan_handle_shift_out_of_bounds+0x37c/0x400 lib/ubsan.c:321

das16m1_attach+0x8c9/0xb00 drivers/comedi/drivers/das16m1.c:526
comedi_device_attach+0x515/0x650 drivers/comedi/drivers.c:996

do_devconfig_ioctl drivers/comedi/comedi_fops.c:851 [inline]
comedi_unlocked_ioctl+0x5ec/0xe90 drivers/comedi/comedi_fops.c:2131

vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fea83a8b9a9

Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48

RSP: 002b:00007fea818f3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fea83cb2fa0 RCX: 00007fea83a8b9a9
RDX: 0000200000000140 RSI: 0000000040946400 RDI: 0000000000000003
RBP: 00007fea83b0dd69 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000

R13: 0000000000000000 R14: 00007fea83cb2fa0 R15: 00007ffcf4c85cc8

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: c79648372d02 Linux 5.15.189
git tree: linux-5.15.y

console output: https://syzkaller.appspot.com/x/log.txt?x=17be7b82580000

kernel config: https://syzkaller.appspot.com/x/.config?x=f3b1215b3cf4119f
dashboard link: https://syzkaller.appspot.com/bug?extid=4c88a95fb2b380b49504
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12db94f0580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=167690a2580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fa511d2a8893/disk-c7964837.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f14b6c77bbb9/vmlinux-c7964837.xz
kernel image: https://storage.googleapis.com/syzbot-assets/388987ba15c6/bzImage-c7964837.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4c88a9...@syzkaller.appspotmail.com

================================================================================
UBSAN: shift-out-of-bounds in drivers/comedi/drivers/das16m1.c:526:9
shift exponent 9574 is too large for 32-bit type 'int'

CPU: 0 PID: 4343 Comm: syz.0.16 Not tainted 5.15.189-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>
dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
ubsan_epilogue+0xa/0x30 lib/ubsan.c:151
__ubsan_handle_shift_out_of_bounds+0x37c/0x400 lib/ubsan.c:321
das16m1_attach+0x8c9/0xb00 drivers/comedi/drivers/das16m1.c:526
comedi_device_attach+0x515/0x650 drivers/comedi/drivers.c:996
do_devconfig_ioctl drivers/comedi/comedi_fops.c:851 [inline]
comedi_unlocked_ioctl+0x5ec/0xe90 drivers/comedi/comedi_fops.c:2131
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0

RIP: 0033:0x7fe60d6c59a9

Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48

RSP: 002b:00007ffc728cf7a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe60d8ecfa0 RCX: 00007fe60d6c59a9

RDX: 0000200000000140 RSI: 0000000040946400 RDI: 0000000000000003

RBP: 00007fe60d747d69 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000

R13: 00007fe60d8ecfa0 R14: 00007fe60d8ecfa0 R15: 0000000000000003
</TASK>
================================================================================


---
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.

[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.

[syzbot]

[syzbot]

Auto-closing this bug as obsolete.

No recent activity, existing reproducers are no longer triggering the issue.