nla_parse: 2 callbacks suppressed
netlink: 1 bytes leftover after parsing attributes in process `syz-executor5'.
BUG: unable to handle kernel NULL pointer dereference at 0000000000000188
IP: crypto_destroy_tfm+0x9f/0xf0 crypto/api.c:577
PGD 0 P4D 0 
Oops: 0000 [#1] SMP
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 5879 Comm: syz-executor6 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_destroy_tfm+0x9f/0xf0 crypto/api.c:577
RSP: 0018:ffffc90000e1fa60 EFLAGS: 00010293
RAX: ffff8801f7ae2280 RBX: 0000000000000000 RCX: ffffffff8167415f
RDX: 0000000000000000 RSI: ffff8801faae5c00 RDI: ffff8801faae5c00
RBP: ffffc90000e1fa80 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90000e1fb70 R11: 0000000000000002 R12: ffff8801faae5c00
R13: ffff8801faae5c00 R14: 0000000000000000 R15: ffff880213d85830
FS:  0000000000000000(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000188 CR3: 000000000301e004 CR4: 00000000001606e0
Call Trace:
 crypto_free_tfm include/linux/crypto.h:641 [inline]
 crypto_free_cipher include/linux/crypto.h:1461 [inline]
 xcbc_exit_tfm+0x19/0x20 crypto/xcbc.c:195
 crypto_destroy_tfm+0xb6/0xf0 crypto/api.c:578
 crypto_free_shash include/crypto/hash.h:695 [inline]
 crypto_exit_shash_ops_async+0x1a/0x20 crypto/shash.c:333
 crypto_exit_ops crypto/api.c:315 [inline]
 crypto_destroy_tfm+0x49/0xf0 crypto/api.c:579
 crypto_free_ahash include/crypto/hash.h:265 [inline]
 hash_release+0x19/0x30 crypto/algif_hash.c:437
 alg_do_release crypto/af_alg.c:119 [inline]
 alg_sock_destruct+0x2d/0x40 crypto/af_alg.c:360
 __sk_destruct+0x2e/0x250 net/core/sock.c:1558
 sk_destruct+0x2f/0x60 net/core/sock.c:1593
 __sk_free+0xbe/0xf0 net/core/sock.c:1601
 sk_free+0x2a/0x40 net/core/sock.c:1612
 sock_put include/net/sock.h:1653 [inline]
 af_alg_release+0x42/0x50 crypto/af_alg.c:126
 sock_release+0x2c/0xc0 net/socket.c:600
 sock_close+0x16/0x20 net/socket.c:1129
 __fput+0x120/0x270 fs/file_table.c:209
 ____fput+0x15/0x20 fs/file_table.c:243
 task_work_run+0xa3/0xe0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x3e6/0x1050 kernel/exit.c:869
 do_group_exit+0x60/0x100 kernel/exit.c:972
 get_signal+0x36c/0xad0 kernel/signal.c:2337
 do_signal+0x23/0x670 arch/x86/kernel/signal.c:809
 exit_to_usermode_loop+0x13c/0x160 arch/x86/entry/common.c:161
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath+0x1b4/0x1e0 arch/x86/entry/common.c:264
 entry_SYSCALL_64_fastpath+0x94/0x96
RIP: 0033:0x452a09
RSP: 002b:00007f0ee9b35ce8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000071bec8 RCX: 0000000000452a09
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000071bec8
RBP: 000000000071bec8 R08: 00000000000005da R09: 000000000071bea0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000a2f7ff R14: 00007f0ee9b369c0 R15: 0000000000000000
Code: 41 ff d6 e8 04 62 c4 ff 4c 89 e7 e8 4c 8d c0 ff 4c 89 ef e8 54 fa d0 ff e8 ef 61 c4 ff 5b 41 5c 41 5d 41 5e 5d c3 e8 e1 61 c4 ff <4c> 8b b3 88 01 00 00 4d 85 f6 74 32 e8 d0 61 c4 ff 4c 89 e7 41 
RIP: crypto_destroy_tfm+0x9f/0xf0 crypto/api.c:577 RSP: ffffc90000e1fa60
CR2: 0000000000000188
---[ end trace 6665c1d87748d3d7 ]---