==================================================================
BUG: KASAN: use-after-free in crypto_aead_alg include/crypto/aead.h:198 [inline]
BUG: KASAN: use-after-free in crypto_aead_encrypt include/crypto/aead.h:330 [inline]
BUG: KASAN: use-after-free in _aead_recvmsg crypto/algif_aead.c:308 [inline]
BUG: KASAN: use-after-free in aead_recvmsg+0x1758/0x1bc0 crypto/algif_aead.c:329
Read of size 4 at addr ffff8801c7b6001c by task syzkaller081892/3406

CPU: 1 PID: 3406 Comm: syzkaller081892 Not tainted 4.15.0-rc2+ #208
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 print_address_description+0x73/0x250 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x25b/0x340 mm/kasan/report.c:409
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429
 crypto_aead_alg include/crypto/aead.h:198 [inline]
 crypto_aead_encrypt include/crypto/aead.h:330 [inline]
 _aead_recvmsg crypto/algif_aead.c:308 [inline]
 aead_recvmsg+0x1758/0x1bc0 crypto/algif_aead.c:329
 sock_recvmsg_nosec net/socket.c:805 [inline]
 sock_recvmsg+0xc9/0x110 net/socket.c:812
BUG: unable to handle kernel NULL pointer dereference at           (null)
IP:           (null)
PGD 1cc12f067 P4D 1cc12f067 PUD 1c7f96067 PMD 0 
Oops: 0010 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3418 Comm: syzkaller081892 Not tainted 4.15.0-rc2+ #208
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: 00000000adbd0689 task.stack: 000000001e5c027e
RIP: 0010:          (null)
RSP: 0018:ffff8801c50a7958 EFLAGS: 00010286
RAX: ffff8801c7b60000 RBX: 1ffff10038a14f2c RCX: ffffffff823a8ded
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8801c50a7960
RBP: ffff8801c50a7b00 R08: 0000000000000000 R09: ffff8801c6360490
R10: 0000000000000008 R11: ffffed0038c6c099 R12: 0000000000000000
R13: ffff8801c7b60028 R14: ffff8801c50a7960 R15: dffffc0000000000
FS:  00007f5cd2f6b700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001c64fc000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 sock_recvmsg_nosec net/socket.c:805 [inline]
 sock_recvmsg+0xc9/0x110 net/socket.c:812
 ___sys_recvmsg+0x29b/0x630 net/socket.c:2207
 __sys_recvmsg+0xe2/0x210 net/socket.c:2252
 SYSC_recvmsg net/socket.c:2264 [inline]
 SyS_recvmsg+0x2d/0x50 net/socket.c:2259
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x44a739
RSP: 002b:00007f5cd2f6adc8 EFLAGS: 00000202 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007f5cd2f6b700 RCX: 000000000044a739
RDX: 0000000000000020 RSI: 00000000201f5000 RDI: 0000000000000006
RBP: 00007ffed823dab0 R08: 00007f5cd2f6b700 R09: 00007f5cd2f6b700
R10: 00007f5cd2f6b700 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffed823daaf R14: 00007f5cd2f6b9c0 R15: 0000000000000000
Code:  Bad RIP value.
RIP:           (null) RSP: ffff8801c50a7958
CR2: 0000000000000000
---[ end trace ce7c8a53d02e8124 ]---