==================================================================
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 ffff8801cbc7655c by task syzkaller706529/3300

CPU: 1 PID: 3300 Comm: syzkaller706529 Not tainted 4.15.0-rc1+ #205
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
BUG: unable to handle kernel NULL pointer dereference at           (null)
IP:           (null)
PGD 1cbfd1067 P4D 1cbfd1067 PUD 1cbfb0067 PMD 0 
Oops: 0010 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3302 Comm: syzkaller706529 Not tainted 4.15.0-rc1+ #205
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: 00000000900e400d task.stack: 00000000dbf76f0d
RIP: 0010:          (null)
RSP: 0018:ffff8801cb247958 EFLAGS: 00010286
RAX: ffff8801cbc76540 RBX: 1ffff10039648f2c RCX: ffffffff823a8d7d
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8801cb247960
RBP: ffff8801cb247b00 R08: 0000000000000000 R09: ffff8801cb404050
R10: 0000000000000008 R11: ffffed0039680811 R12: ffff8801cac10818
R13: ffff8801cbc76568 R14: ffff8801cb247960 R15: dffffc0000000000
FS:  00007fe861fa8700(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001cbb53000 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: 0033:0x447a79
RSP: 002b:00007fe861fa7d08 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007fe861fa8700 RCX: 0000000000447a79
RDX: 0000000000000003 RSI: 000000002094ffc8 RDI: 0000000000000004
RBP: 00007fff7388e3c0 R08: 00007fe861fa8700 R09: 00007fe861fa8700
R10: 00007fe861fa8700 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff7388e3bf R14: 00007fe861fa89c0 R15: 0000000000000000
Code:  Bad RIP value.
RIP:           (null) RSP: ffff8801cb247958
CR2: 0000000000000000
---[ end trace 90be1768f90323d3 ]---