netlink: 22 bytes leftover after parsing attributes in process `syz-executor3'.
netlink: 1 bytes leftover after parsing attributes in process `syz-executor6'.
BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
IP: __crypto_alg_lookup+0x43/0x190 crypto/api.c:63
PGD 20f034067 P4D 20f034067 PUD 1db3bb067 PMD 0 
Oops: 0000 [#1] SMP
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 9836 Comm: syz-executor4 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:ffffc90000f27cb8 EFLAGS: 00010206
RAX: 0000000000010000 RBX: 0000000000000000 RCX: ffffffff816741f3
RDX: 00000000000001a0 RSI: ffffc90003611000 RDI: ffff8801df13e08a
RBP: ffffc90000f27d00 R08: 0000000000000001 R09: 0000000000000001
R10: ffffc90000f27c80 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000002c8f R14: 000000000000240e R15: 000000000000040f
FS:  00007f9179b1b700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000020 CR3: 00000001dda9c000 CR4: 00000000001406e0
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_ahash+0x2c/0x40 crypto/ahash.c:540
 hash_bind+0x51/0x90 crypto/algif_hash.c:422
 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: 0033:0x452a39
RSP: 002b:00007f9179b1ac58 EFLAGS: 00000212 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452a39
RDX: 0000000000000058 RSI: 0000000020009fc3 RDI: 0000000000000014
RBP: 0000000000000486 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4d30
R13: 00000000ffffffff R14: 00007f9179b1b6d4 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: ffffc90000f27cb8
CR2: 0000000000000020
---[ end trace bbd0408ac195c80e ]---