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: 5089 Comm: syz-executor6 Not tainted 4.14.0-rc5-mm1+ #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
FAULT_FLAG_ALLOW_RETRY missing 30
CPU: 0 PID: 5070 Comm: syz-executor7 Not tainted 4.14.0-rc5-mm1+ #20
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:16 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:52
 handle_userfault+0x11ec/0x23a0 fs/userfaultfd.c:427
 do_anonymous_page mm/memory.c:3121 [inline]
 handle_pte_fault mm/memory.c:3934 [inline]
 __handle_mm_fault+0x2d46/0x39c0 mm/memory.c:4060
 handle_mm_fault+0x334/0x8d0 mm/memory.c:4097
 __do_page_fault+0x5bd/0xd60 arch/x86/mm/fault.c:1438
 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1514
 page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1066
RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:600 [inline]
RIP: 0010:iov_iter_fault_in_readable+0x1a7/0x410 lib/iov_iter.c:421
RSP: 0018:ffff8801cc917928 EFLAGS: 00010246
RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff823f3bf1
RDX: 0000000000000108 RSI: ffffc900021c2000 RDI: ffff8801cc917d28
RBP: ffff8801cc917a08 R08: 0000000000000001 R09: 1ffff10039922ee7
R10: ffff8801cc917858 R11: 0000000000000003 R12: 1ffff10039922f28
R13: ffff8801cc9179e0 R14: 0000000000000000 R15: ffff8801cc917d20
 generic_perform_write+0x200/0x600 mm/filemap.c:3128
 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3263
 generic_file_write_iter+0x399/0x790 mm/filemap.c:3291
 call_write_iter include/linux/fs.h:1770 [inline]
 new_sync_write fs/read_write.c:468 [inline]
 __vfs_write+0x684/0x970 fs/read_write.c:481
 vfs_write+0x189/0x510 fs/read_write.c:543
 SYSC_write fs/read_write.c:588 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:580
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x452869
RSP: 002b:00007fc50e23fbe8 EFLAGS: 00000212 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00000000007580d8 RCX: 0000000000452869
RDX: 0000000000000030 RSI: 0000000020011fd2 RDI: 0000000000000014
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a6f7ff R14: 00007fc50e2409c0 R15: 0000000000000001
task: ffff8801cc380480 task.stack: ffff8801cd6c8000
RIP: 0010:asn1_ber_decoder+0x431/0x1c20 lib/asn1_decoder.c:233
RSP: 0018:ffff8801cd6cf908 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffc90003b75000 RDI: ffffffff851d1208
RBP: ffff8801cd6cfbc0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801cd6cfb98
FS:  00007f96b30ec700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020e5d000 CR3: 00000001cc93f000 CR4: 00000000001426e0
DR0: 0000000020001000 DR1: 0000000020001000 DR2: 0000000020001000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
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: 0033:0x452869
RSP: 002b:00007f96b30ebbe8 EFLAGS: 00000212 ORIG_RAX: 00000000000000f8
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452869
RDX: 0000000020e5c000 RSI: 0000000020bc4ffb RDI: 0000000020e5cff5
RBP: 0000000000000082 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3d58
R13: 00000000ffffffff R14: 00007f96b30ec6d4 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: ffff8801cd6cf908
---[ end trace 001bf03a73aff199 ]---