BUG: kernel NULL pointer dereference, address: 0000000000000427
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 80000001aa4f4067 P4D 80000001aa4f4067 PUD 0 
Oops: Oops: 0002 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 14235 Comm: syz.2.2991 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:parport_attach+0x6a4/0x930
Code: 80 3c 2e 00 74 08 48 89 df e8 18 da 0a f9 0f b7 13 31 ed 31 c0 ee 43 80 3c 2e 00 74 08 48 89 df e8 01 da 0a f9 8b 13 83 c2 02 <31> 66 90 89 e8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 44
RSP: 0018:ffffc900069c79e8 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff8881122319c0 RCX: 0000000000080000
RDX: 000000000000007a RSI: 0000000000000497 RDI: 0000000000000498
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000000
R10: 000000000000000a R11: ffffffff8eb59c60 R12: ffff88816cf93b00
R13: dffffc0000000000 R14: 1ffff11022446338 R15: 1ffff11022446336
FS:  00007f8e42e4a6c0(0000) GS:ffff8882a8f51000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000427 CR3: 00000001be1d4000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 comedi_device_attach+0x52d/0x720
 comedi_unlocked_ioctl+0x8ef/0x1af0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8e41f9de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8e42e4a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8e42225fa0 RCX: 00007f8e41f9de99
RDX: 0000200000000600 RSI: 0000000040946400 RDI: 0000000000000003
RBP: 00007f8e42033eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8e42226038 R14: 00007f8e42225fa0 R15: 00007fff5fb0a7f8
 </TASK>
Modules linked in:
CR2: 0000000000000427
---[ end trace 0000000000000000 ]---
RIP: 0010:parport_attach+0x6a4/0x930
Code: 80 3c 2e 00 74 08 48 89 df e8 18 da 0a f9 0f b7 13 31 ed 31 c0 ee 43 80 3c 2e 00 74 08 48 89 df e8 01 da 0a f9 8b 13 83 c2 02 <31> 66 90 89 e8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 44
RSP: 0018:ffffc900069c79e8 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffff8881122319c0 RCX: 0000000000080000
RDX: 000000000000007a RSI: 0000000000000497 RDI: 0000000000000498
RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000000
R10: 000000000000000a R11: ffffffff8eb59c60 R12: ffff88816cf93b00
R13: dffffc0000000000 R14: 1ffff11022446338 R15: 1ffff11022446336
FS:  00007f8e42e4a6c0(0000) GS:ffff8882a8f51000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8e41feb580 CR3: 00000001be1d4000 CR4: 00000000000006f0
