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UBSAN: shift-out-of-bounds in aio_iiro_16_attach

Status: upstream: reported C repro on 2025/07/07 16:32
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+f1bb7e4ea47ea12b535c@syzkaller.appspotmail.com
First crash: 4d22h, last: 11h15m
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] comedi: aio_iiro_16: Prevent invlaid irq number 2 (2) 2025/07/08 13:18
[syzbot] [kernel?] UBSAN: shift-out-of-bounds in aio_iiro_16_attach 1 (3) 2025/07/08 12:37
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2025/07/08 12:18 17m eadavis@qq.com patch upstream OK log

Sample crash report:
UBSAN: shift-out-of-bounds in drivers/comedi/drivers/aio_iiro_16.c:180:9
shift exponent 8550 is too large for 32-bit type 'int'
CPU: 2 UID: 0 PID: 6096 Comm: syz.0.16 Not tainted 6.16.0-rc4-syzkaller-00308-ga79a588fc176 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120
 ubsan_epilogue lib/ubsan.c:233 [inline]
 __ubsan_handle_shift_out_of_bounds+0x27f/0x420 lib/ubsan.c:494
 aio_iiro_16_attach drivers/comedi/drivers/aio_iiro_16.c:180 [inline]
 aio_iiro_16_attach.cold+0x19/0x1e drivers/comedi/drivers/aio_iiro_16.c:164
 comedi_device_attach+0x3b3/0x900 drivers/comedi/drivers.c:996
 do_devconfig_ioctl+0x1a7/0x580 drivers/comedi/comedi_fops.c:855
 comedi_unlocked_ioctl+0x15bb/0x2e90 drivers/comedi/comedi_fops.c:2136
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3eb858e929
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:00007ffc84ea1e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3eb87b5fa0 RCX: 00007f3eb858e929
RDX: 0000200000000140 RSI: 0000000040946400 RDI: 0000000000000003
RBP: 00007f3eb8610b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3eb87b5fa0 R14: 00007f3eb87b5fa0 R15: 0000000000000003
 </TASK>
---[ end trace ]---

Crashes (18):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/05 20:51 upstream a79a588fc176 4f67c4ae .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/05 20:19 upstream a79a588fc176 4f67c4ae .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/09 21:56 linux-next 835244aba90d f4e5e155 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/09 04:20 upstream d006330be3f7 abade794 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/10 06:52 upstream 8c2e52ebbe88 956bd956 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/08 22:38 upstream d006330be3f7 4d9fdfa4 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/08 14:50 upstream d7b8f8e20813 4d9fdfa4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/08 14:50 upstream d7b8f8e20813 4d9fdfa4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/08 14:49 upstream d7b8f8e20813 4d9fdfa4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/08 05:39 upstream d7b8f8e20813 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/08 03:30 upstream d7b8f8e20813 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/07 20:30 upstream d7b8f8e20813 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/07 15:05 upstream d7b8f8e20813 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/07 00:11 upstream 772b78c2abd8 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/06 19:28 upstream 1f988d0788f5 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/06 16:27 upstream 1f988d0788f5 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/06 12:03 upstream 1f988d0788f5 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in aio_iiro_16_attach
2025/07/05 19:50 upstream a79a588fc176 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in aio_iiro_16_attach
* Struck through repros no longer work on HEAD.