kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 7737 Comm: syz-executor2 Not tainted 4.14.0-rc5-mm1+ #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c8bee640 task.stack: ffff8801c54e8000
RIP: 0010:asn1_ber_decoder+0x431/0x1c20 lib/asn1_decoder.c:233
RSP: 0018:ffff8801c54ef908 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffc900035b1000 RDI: ffffffff851d1208
RBP: ffff8801c54efbc0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801c54efb98
FS:  00007f2f6cce9700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000a6fa38 CR3: 00000001c7718000 CR4: 00000000001426e0
Call Trace:
 pkcs7_parse_message+0x2b3/0x710 crypto/asymmetric_keys/pkcs7_parser.c:136
 verify_pkcs7_signature+0x8d/0x290 certs/system_keyring.c:216
 pkcs7_preparse+0x7b/0xc0 crypto/asymmetric_keys/pkcs7_key_type.c:63
 key_create_or_update+0x4c6/0xe20 security/keys/key.c:846
 SYSC_add_key security/keys/keyctl.c:122 [inline]
 SyS_add_key+0x18a/0x340 security/keys/keyctl.c:62
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x452879
RSP: 002b:00007f2f6cce8be8 EFLAGS: 00000212 ORIG_RAX: 00000000000000f8
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452879
RDX: 0000000020000000 RSI: 00000000203ed000 RDI: 00000000208c7000
RBP: 0000000000000082 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ee1a8
R13: 00000000ffffffff R14: 00007f2f6cce96d4 R15: 0000000000000000
Code: 1a ff 48 8d 43 01 49 89 87 80 fe ff ff 48 89 85 90 fd ff ff 48 8b 85 b8 fd ff ff 48 01 d8 48 89 c2 48 89 c1 48 c1 ea 03 83 e1 07 <42> 0f b6 14 32 38 ca 7f 08 84 d2 0f 85 e5 0f 00 00 0f b6 00 88 
RIP: asn1_ber_decoder+0x431/0x1c20 lib/asn1_decoder.c:233 RSP: ffff8801c54ef908
---[ end trace fb3f29a5f5c5501a ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..