Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 0 UID: 0 PID: 18050 Comm: syz.5.4712 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 69 9b 35 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 48 9b 35 f9 4d 8b 24 24 48 83 c3
RSP: 0018:ffffc90006a37a60 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff888022e52e80 RCX: 0000000000080000
RDX: ffffc90029001000 RSI: 00000000000003bc RDI: 00000000000003bd
RBP: 0000000000000001 R08: ffff888020ae612f R09: 1ffff1100415cc25
R10: dffffc0000000000 R11: ffffffff88ed6a00 R12: 0000000000000028
R13: dffffc0000000000 R14: ffff888020ae6000 R15: dffffc0000000000
FS:  00007fa7f0ff66c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa7f2fd03e0 CR3: 000000003ce2a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
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: 0033:0x7fa7f2d8ec29
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:00007fa7f0ff6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa7f2fd5fa0 RCX: 00007fa7f2d8ec29
RDX: 0000000000000000 RSI: 0000000040946400 RDI: 0000000000000003
RBP: 00007fa7f2e11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa7f2fd6038 R14: 00007fa7f2fd5fa0 R15: 00007ffff7d1edd8
 </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 69 9b 35 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 48 9b 35 f9 4d 8b 24 24 48 83 c3
RSP: 0018:ffffc90006a37a60 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff888022e52e80 RCX: 0000000000080000
RDX: ffffc90029001000 RSI: 00000000000003bc RDI: 00000000000003bd
RBP: 0000000000000001 R08: ffff888020ae612f R09: 1ffff1100415cc25
R10: dffffc0000000000 R11: ffffffff88ed6a00 R12: 0000000000000028
R13: dffffc0000000000 R14: ffff888020ae6000 R15: dffffc0000000000
FS:  00007fa7f0ff66c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa7f0fd4fc8 CR3: 000000003ce2a000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
