BUG: unable to handle kernel NULL pointer dereference at           (null)
IP:           (null)
PGD 0 P4D 0 
Oops: 0010 [#1] SMP
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3180 Comm: syzkaller654271 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:ffffc900018dbc80 EFLAGS: 00010293
RAX: ffff88021353e450 RBX: ffff880211664108 RCX: ffffffff816782ad
RDX: 0000000000000000 RSI: ffff880211664108 RDI: ffff880211664100
RBP: ffffc900018dbc90 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff880211664108
R13: ffff880211664100 R14: ffffffff816782a0 R15: ffff880213ebf430
FS:  0000000000000000(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000000301e000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 crypto_exit_ops crypto/api.c:315 [inline]
 crypto_destroy_tfm+0x49/0xf0 crypto/api.c:579
 crypto_free_aead include/crypto/aead.h:193 [inline]
 aead_release+0x19/0x30 crypto/algif_aead.c:511
 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
 SYSC_exit_group kernel/exit.c:983 [inline]
 SyS_exit_group+0x18/0x20 kernel/exit.c:981
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x440789
RSP: 002b:00007fff79ce16a8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00000000004a2030 RCX: 0000000000440789
RDX: 0000000000440789 RSI: 0000000000000058 RDI: 0000000000000000
RBP: 0000000000006595 R08: 0000000000000000 R09: 0000000000000c65
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000401cc0 R14: 0000000000000000 R15: 0000000000000000
Code:  Bad RIP value.
RIP:           (null) RSP: ffffc900018dbc80
CR2: 0000000000000000
---[ end trace 71786329e7f7d7cb ]---