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UBSAN: shift-out-of-bounds in pcl726_attach

Status: upstream: reported C repro on 2025/07/05 11:02
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+5cd373521edd68bebcb3@syzkaller.appspotmail.com
First crash: 8d08h, last: 1d13h
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] commdi: pcl726: Prevent invalid irq number 6 (6) 2025/07/07 12:39
[syzbot] [kernel?] UBSAN: shift-out-of-bounds in pcl726_attach 2 (5) 2025/07/06 02:10
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 UBSAN: shift-out-of-bounds in pcl726_attach origin:upstream -1 C 4 5d05h 5d08h 0/3 upstream: reported C repro on 2025/07/08 03:45
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2025/07/06 01:51 17m eadavis@qq.com patch upstream OK log
2025/07/05 12:47 17m hdanton@sina.com patch upstream OK log

Sample crash report:
------------[ cut here ]------------
UBSAN: shift-out-of-bounds in drivers/comedi/drivers/pcl726.c:331:46
shift exponent -2147450880 is negative
CPU: 2 UID: 0 PID: 6107 Comm: syz.0.16 Not tainted 6.16.0-rc4-syzkaller-00286-gc435a4f487e8 #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
 pcl726_attach.cold+0x19/0x1e drivers/comedi/drivers/pcl726.c:331
 comedi_device_attach+0x3b0/0x900 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+0x18b/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: 0033:0x7fcefa58e929
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:00007ffd9f2c5a28 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fcefa7b5fa0 RCX: 00007fcefa58e929
RDX: 0000200000002b40 RSI: 0000000040946400 RDI: 0000000000000003
RBP: 00007fcefa610b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcefa7b5fa0 R14: 00007fcefa7b5fa0 R15: 0000000000000003
 </TASK>
---[ end trace ]---

Crashes (33):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/05 03:48 upstream c435a4f487e8 4f67c4ae .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/05 03:27 upstream c435a4f487e8 4f67c4ae .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/11 03:59 linux-next b551c4e2a98a 3cda49cf .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/09 13:01 linux-next 58ba80c47402 abade794 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/08 23:29 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 pcl726_attach
2025/07/08 11:41 upstream d7b8f8e20813 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/07 16:22 upstream d7b8f8e20813 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/07 14:02 upstream d7b8f8e20813 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/11 22:30 upstream 40f92e79b0aa 3cda49cf .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/11 06:36 upstream bc9ff192a6c9 3cda49cf .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/09 08:13 upstream 733923397fd9 f4e5e155 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/08 21:51 upstream d006330be3f7 4d9fdfa4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/08 21:51 upstream d006330be3f7 4d9fdfa4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/08 21:50 upstream d006330be3f7 4d9fdfa4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/08 21:50 upstream d006330be3f7 4d9fdfa4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/08 21:49 upstream d006330be3f7 4d9fdfa4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/08 05:47 upstream d7b8f8e20813 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/07 15:04 upstream d7b8f8e20813 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/07 00:44 upstream 772b78c2abd8 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/06 16:45 upstream 1f988d0788f5 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/06 14:58 upstream 1f988d0788f5 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/06 13:30 upstream 1f988d0788f5 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/06 06:23 upstream 1f988d0788f5 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/06 06:09 upstream 1f988d0788f5 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/05 09:00 upstream c435a4f487e8 4f67c4ae .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/05 03:07 upstream c435a4f487e8 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/05 03:06 upstream c435a4f487e8 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/05 03:06 upstream c435a4f487e8 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/05 03:06 upstream c435a4f487e8 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/11 14:11 upstream bc9ff192a6c9 3cda49cf .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/07 15:28 upstream d7b8f8e20813 4f67c4ae .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/10 01:45 linux-next 835244aba90d f4e5e155 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root UBSAN: shift-out-of-bounds in pcl726_attach
2025/07/07 19:10 linux-next 26ffb3d6f02c 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce UBSAN: shift-out-of-bounds in pcl726_attach
* Struck through repros no longer work on HEAD.