BUG: kernel NULL pointer dereference, address: 000000000000000e
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 126f3c067 P4D 126f3c067 PUD 126f24067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP
CPU: 0 PID: 10771 Comm: kworker/u4:3 Not tainted 5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:strnlen+0x17/0x30 lib/string.c:582
Code: 38 00 75 f7 48 29 f8 c3 31 c0 c3 0f 1f 84 00 00 00 00 00 48 8d 14 37 48 85 f6 48 89 f8 75 0b eb 19 48 83 c0 01 48 39 c2 74 09 <80> 38 00 75 f2 48 29 f8 c3 48 89 d0 48 29 f8 c3 31 c0 c3 66 0f 1f
RSP: 0018:ffffc90003293e78 EFLAGS: 00010206
RAX: 000000000000000e RBX: 0000000000000000 RCX: 0000000000000000
RDX: 000000000002000e RSI: 0000000000020000 RDI: 000000000000000e
RBP: ffff888126894000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81566c4e R11: 0000000000000000 R12: ffff888126894000
R13: ffff888127508400 R14: ffff888119eac000 R15: 000000000000000e
FS:  0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000000e CR3: 0000000126f3b000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 strnlen include/linux/fortify-string.h:71 [inline]
 copy_string_kernel+0x28/0x300 fs/exec.c:610
 copy_strings_kernel+0x6b/0xe0 fs/exec.c:653
 kernel_execve+0x1a2/0x290 fs/exec.c:1969
 call_usermodehelper_exec_async+0xea/0x1c0 kernel/umh.c:112
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Modules linked in:
CR2: 000000000000000e
---[ end trace 96e7afbc0dbaccb9 ]---
RIP: 0010:strnlen+0x17/0x30 lib/string.c:582
Code: 38 00 75 f7 48 29 f8 c3 31 c0 c3 0f 1f 84 00 00 00 00 00 48 8d 14 37 48 85 f6 48 89 f8 75 0b eb 19 48 83 c0 01 48 39 c2 74 09 <80> 38 00 75 f2 48 29 f8 c3 48 89 d0 48 29 f8 c3 31 c0 c3 66 0f 1f
RSP: 0018:ffffc90003293e78 EFLAGS: 00010206
RAX: 000000000000000e RBX: 0000000000000000 RCX: 0000000000000000
RDX: 000000000002000e RSI: 0000000000020000 RDI: 000000000000000e
RBP: ffff888126894000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81566c4e R11: 0000000000000000 R12: ffff888126894000
R13: ffff888127508400 R14: ffff888119eac000 R15: 000000000000000e
FS:  0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000000000e CR3: 0000000126f3b000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400