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Sat, 27 Sep 2025 17:36:33 -0700 (PDT) Date: Sat, 27 Sep 2025 17:36:33 -0700 In-Reply-To: <686bf6a0.a00a0220.b087d.01f2.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68d88311.050a0220.25d7ab.042d.GAE@google.com> Subject: Forwarded: Re: [syzbot] [kernel?] UBSAN: shift-out-of-bounds in aio_iiro_16_attach From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [syzbot] [kernel?] UBSAN: shift-out-of-bounds in aio_iiro_16_a= ttach Author: xandfury@gmail.com syzbot writes: > Hello, > > syzbot found the following issue on: > > HEAD commit: a79a588fc176 Merge tag =E2=80=99pm-6.16-rc5=E2=80=99 of g= it://git.kernel.o.. > git tree: upstream > console output: > kernel config: > dashboard link: > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for D= ebian) 2.40 > syz repro: > C reproducer: > > Downloadable assets: > disk image (non-bootable): > vmlinux: > kernel image: > > IMPORTANT: if you fix the issue, please add the following tag to the comm= it: > Reported-by: syzbot+f1bb7e4ea47ea12b535c@syzkaller.appspotmail.com > > 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 =E2=80=99int=E2=80=99 > CPU: 2 UID: 0 PID: 6096 Comm: syz.0.16 Not tainted 6.16.0-rc4-syzkaller-0= 0308-ga79a588fc176 #0 PREEMPT(full)=20 > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.= 16.3-2~bpo12+1 04/01/2014 > Call Trace: > > __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:1= 64 > 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 > > =E2=80=94[ end trace ]=E2=80=94 > > > =E2=80=94 > This report is generated by a bot. It may contain errors. > See for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > 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=E2=80=99s 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 #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git= 66acb1586737