Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 1 UID: 0 PID: 8350 Comm: syz.1.949 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:pcl818_ai_cancel+0x69/0x3f0
Code: 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 f9 13 36 f9 48 8b 03 48 89 04 24 49 83 c4 28 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 d8 13 36 f9 4d 8b 24 24 48 83 c3
RSP: 0018:ffffc9000dd0fa60 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff88802e986100 RCX: 0000000000080000
RDX: ffffc90004213000 RSI: 000000000000041b RDI: 000000000000041c
RBP: 0000000000000001 R08: ffff88810e7f712f R09: 1ffff11021cfee25
R10: dffffc0000000000 R11: ffffffff88ece2a0 R12: 0000000000000028
R13: dffffc0000000000 R14: ffff88810e7f7000 R15: dffffc0000000000
FS:  00007f1e713b86c0(0000) GS:ffff8881a3c18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32523ffc CR3: 00000000244c0000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 pcl818_detach+0x66/0xd0
 comedi_device_detach_locked+0x178/0x750
 comedi_unlocked_ioctl+0xcde/0x1020
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1e7058ebe9
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:00007f1e713b8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1e707c5fa0 RCX: 00007f1e7058ebe9
RDX: 0000000000000000 RSI: 0000000040946400 RDI: 0000000000000003
RBP: 00007f1e70611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1e707c6038 R14: 00007f1e707c5fa0 R15: 00007ffec52a6328
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:pcl818_ai_cancel+0x69/0x3f0
Code: 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 f9 13 36 f9 48 8b 03 48 89 04 24 49 83 c4 28 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 d8 13 36 f9 4d 8b 24 24 48 83 c3
RSP: 0018:ffffc9000dd0fa60 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff88802e986100 RCX: 0000000000080000
RDX: ffffc90004213000 RSI: 000000000000041b RDI: 000000000000041c
RBP: 0000000000000001 R08: ffff88810e7f712f R09: 1ffff11021cfee25
R10: dffffc0000000000 R11: ffffffff88ece2a0 R12: 0000000000000028
R13: dffffc0000000000 R14: ffff88810e7f7000 R15: dffffc0000000000
FS:  00007f1e713b86c0(0000) GS:ffff8880b8618000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc04d1cff8 CR3: 00000000244c0000 CR4: 00000000000006f0
