BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
IP: __crypto_alg_lookup+0x43/0x190 crypto/api.c:63
PGD 1fa1f6067 P4D 1fa1f6067 PUD 1fd791067 PMD 0 
Oops: 0000 [#1] SMP
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 12687 Comm: syz-executor3 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:__crypto_alg_lookup+0x43/0x190 crypto/api.c:63
RSP: 0018:ffffc90005ca7ca0 EFLAGS: 00010216
RAX: 0000000000010000 RBX: 0000000000000000 RCX: ffffffff816741f3
RDX: 0000000000001257 RSI: ffffc90002b67000 RDI: ffff88020c014881
RBP: ffffc90005ca7ce8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffc90005ca7c68 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: 000000000000248c R15: 0000000000000405
FS:  00007f4c87e43700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000020 CR3: 00000001fdd6f001 CR4: 00000000001606e0
Call Trace:
 crypto_alg_lookup+0x31/0x50 crypto/api.c:201
 crypto_larval_lookup.part.8+0x34/0x1c0 crypto/api.c:218
 crypto_larval_lookup crypto/api.c:212 [inline]
 crypto_alg_mod_lookup+0x77/0x120 crypto/api.c:271
 crypto_find_alg crypto/api.c:501 [inline]
 crypto_alloc_tfm+0x67/0x180 crypto/api.c:534
 crypto_alloc_skcipher+0x2c/0x40 crypto/skcipher.c:927
 crypto_get_default_null_skcipher+0x5f/0x80 crypto/crypto_null.c:164
 crypto_get_default_null_skcipher2 include/crypto/null.h:17 [inline]
 aead_bind+0x66/0xc0 crypto/algif_aead.c:494
 alg_bind+0x94/0x180 crypto/af_alg.c:179
 SYSC_bind+0xa8/0x130 net/socket.c:1454
 SyS_bind+0x24/0x30 net/socket.c:1440
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a09
RSP: 002b:00007f4c87e42c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452a09
RDX: 0000000000000058 RSI: 0000000020f3bfa8 RDI: 0000000000000013
RBP: 00000000000002cc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f13c0
R13: 00000000ffffffff R14: 00007f4c87e436d4 R15: 0000000000000000
Code: 89 7d d0 e8 70 61 c4 ff 48 8b 1d 89 df a6 01 48 81 fb 60 21 0e 83 0f 84 4c 01 00 00 c7 45 c4 fe ff ff ff 45 31 e4 e8 4d 61 c4 ff <44> 8b 6b 20 41 f6 c5 60 0f 85 03 01 00 00 e8 3a 61 c4 ff 44 89 
RIP: __crypto_alg_lookup+0x43/0x190 crypto/api.c:63 RSP: ffffc90005ca7ca0
CR2: 0000000000000020
BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
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