BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
PGD 80000001925f9067 P4D 80000001925f9067 PUD 10999e067 PMD 0 
Oops: 0000 [#1] SMP PTI
CPU: 0 PID: 16368 Comm: syz-executor3 Not tainted 4.18.0-rc4+ #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:map_vm_area+0x69/0x1f0 mm/vmalloc.c:1340
Code: 08 48 89 45 a0 41 8b 84 24 90 0c 00 00 89 45 cc 45 8b bc 24 88 0c 00 00 e8 a4 4a b3 ff 4d 8d 75 08 48 85 db 0f 85 5b 01 00 00 <49> 8b 45 08 48 89 45 a8 4c 89 f7 e8 17 f2 0e 00 4d 8d 75 18 48 8b 
RSP: 0018:ffff88010b8bf898 EFLAGS: 00010046
RAX: ffffffff81b4e06c RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc90003fac000 RSI: 000000000002a48f RDI: 000000000002a490
RBP: ffff88010b8bf910 R08: 00000000004000c0 R09: ffff88021fc39090
R10: 0000000000000002 R11: 0000000000000000 R12: ffff88021fc39090
R13: 0000000000000000 R14: 0000000000000008 R15: 0000000000000000
FS:  00007fdbafb30700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 000000010c892000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 kmsan_vmap+0x134/0x200 mm/kmsan/kmsan_hooks.c:181
 vmap+0x3b2/0x540 mm/vmalloc.c:1648
 big_key_alloc_buffer+0x638/0xa30 security/keys/big_key.c:190
 big_key_preparse+0x211/0xf10 security/keys/big_key.c:230
 key_create_or_update+0x822/0x1ce0 security/keys/key.c:849
 __do_sys_add_key security/keys/keyctl.c:122 [inline]
 __se_sys_add_key+0x760/0x9c0 security/keys/keyctl.c:62
 __x64_sys_add_key+0x15d/0x1b0 security/keys/keyctl.c:62
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ab9
Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007fdbafb2fc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000f8
RAX: ffffffffffffffda RBX: 00007fdbafb306d4 RCX: 0000000000455ab9
RDX: 00000000200001c0 RSI: 0000000020000180 RDI: 0000000020000140
RBP: 000000000072bea0 R08: fffffffffffffffe R09: 0000000000000000
R10: 0000000000000320 R11: 0000000000000246 R12: 0000000000000013
R13: 00000000004bb527 R14: 00000000004c87a0 R15: 000000000000000b
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000000000008
---[ end trace 4faf6522f32bc648 ]---
RIP: 0010:map_vm_area+0x69/0x1f0 mm/vmalloc.c:1340
Code: 08 48 89 45 a0 41 8b 84 24 90 0c 00 00 89 45 cc 45 8b bc 24 88 0c 00 00 e8 a4 4a b3 ff 4d 8d 75 08 48 85 db 0f 85 5b 01 00 00 <49> 8b 45 08 48 89 45 a8 4c 89 f7 e8 17 f2 0e 00 4d 8d 75 18 48 8b 
RSP: 0018:ffff88010b8bf898 EFLAGS: 00010046
RAX: ffffffff81b4e06c RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc90003fac000 RSI: 000000000002a48f RDI: 000000000002a490
RBP: ffff88010b8bf910 R08: 00000000004000c0 R09: ffff88021fc39090
R10: 0000000000000002 R11: 0000000000000000 R12: ffff88021fc39090
R13: 0000000000000000 R14: 0000000000000008 R15: 0000000000000000
FS:  00007fdbafb30700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 000000010c892000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600