BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 69c04067 P4D 69c04067 PUD 75b59067 PMD 0
Oops: Oops: 0010 [#1] SMP KASAN NOPTI
CPU: 3 UID: 0 PID: 16775 Comm: syz.1.2616 Not tainted 6.16.0-rc5-syzkaller-00224-g379f604cc3dc #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
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc90003e0fb68 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00000000000065d4 RCX: ffffc9003358f000
RDX: ffff888065e40008 RSI: 00000000000065d4 RDI: ffff888049f6c800
RBP: ffff888065e40004 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888049f6c800
R13: ffff888065e40000 R14: 0000000000000001 R15: 0000000000000003
FS: 0000000000000000(0000) GS:ffff888097820000(0063) knlGS:00000000f50aeb40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000075b5b000 CR4: 0000000000352ef0
Call Trace:
<TASK>
get_valid_routes drivers/comedi/comedi_fops.c:1305 [inline]
parse_insn+0x789/0x1970 drivers/comedi/comedi_fops.c:1384
do_insnlist_ioctl+0x2c6/0x6b0 drivers/comedi/comedi_fops.c:1568
compat_insnlist drivers/comedi/comedi_fops.c:3160 [inline]
comedi_compat_ioctl+0x7f1/0x910 drivers/comedi/comedi_fops.c:3225
__do_compat_sys_ioctl fs/ioctl.c:1005 [inline]
__se_compat_sys_ioctl fs/ioctl.c:948 [inline]
__ia32_compat_sys_ioctl+0x242/0x370 fs/ioctl.c:948
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf70be579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f50ae55c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000008008640b
RDX: 00000000801afec0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc90003e0fb68 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 00000000000065d4 RCX: ffffc9003358f000
RDX: ffff888065e40008 RSI: 00000000000065d4 RDI: ffff888049f6c800
RBP: ffff888065e40004 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888049f6c800
R13: ffff888065e40000 R14: 0000000000000001 R15: 0000000000000003
FS: 0000000000000000(0000) GS:ffff888097820000(0063) knlGS:00000000f50aeb40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000075b5b000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 10 06 adc %al,(%rsi)
2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi
6: 10 07 adc %al,(%rdi)
8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi
c: 10 08 adc %cl,(%rax)
e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi
1e: 00 51 52 add %dl,0x52(%rcx)
21: 55 push %rbp
22: 89 e5 mov %esp,%ebp
24: 0f 34 sysenter
26: cd 80 int $0x80
* 28: 5d pop %rbp <-- trapping instruction
29: 5a pop %rdx
2a: 59 pop %rcx
2b: c3 ret
2c: 90 nop
2d: 90 nop
2e: 90 nop
2f: 90 nop
30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi