BUG: unable to handle kernel NULL pointer dereference at           (null)
IP:           (null)
PGD 20fff5067 P4D 20fff5067 PUD 1ff31a067 PMD 0 
Oops: 0010 [#1] SMP
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3574 Comm: syz-executor0 Not tainted 4.15.0-rc3-next-20171214+ #67
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:          (null)
RSP: 0018:ffffc90001177df0 EFLAGS: 00010212
RAX: 0000000000010000 RBX: ffff8801fdb92b00 RCX: ffffffff8167e521
RDX: 0000000000000010 RSI: ffff8801fdba89e0 RDI: ffff8801fdb92b00
RBP: ffffc90001177e30 R08: b7db545ced0cb6b3 R09: 0000000000000001
R10: ffffc90001177df8 R11: 0000000000000000 R12: ffff8801fdba89e0
R13: 0000000000000010 R14: 00000000fffffff2 R15: ffff880216bfe850
FS:  00007f2a6f122700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000002157e2002 CR4: 00000000001606f0
Call Trace:
 shash_async_setkey+0x29/0x30 crypto/shash.c:208
 crypto_ahash_setkey+0x40/0xc0 crypto/ahash.c:200
 hash_setkey+0x25/0x40 crypto/algif_hash.c:446
 alg_setkey crypto/af_alg.c:221 [inline]
 alg_setsockopt+0x140/0x180 crypto/af_alg.c:254
 SYSC_setsockopt net/socket.c:1829 [inline]
 SyS_setsockopt+0x8a/0x100 net/socket.c:1808
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a09
RSP: 002b:00007f2a6f121c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452a09
RDX: 0000000000000001 RSI: 0000000000000117 RDI: 0000000000000013
RBP: 0000000000000554 R08: 0000000000000010 R09: 0000000000000000
R10: 00000000203c1000 R11: 0000000000000212 R12: 00000000006f5080
R13: 00000000ffffffff R14: 00007f2a6f1226d4 R15: 0000000000000000
Code:  Bad RIP value.
RIP:           (null) RSP: ffffc90001177df0
CR2: 0000000000000000
---[ end trace ffc8f8cd267e314b ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..