==================================================================
BUG: KASAN: use-after-free in skcipher_request_set_tfm include/crypto/skcipher.h:499 [inline]
BUG: KASAN: use-after-free in crypto_aead_copy_sgl crypto/algif_aead.c:85 [inline]
BUG: KASAN: use-after-free in _aead_recvmsg crypto/algif_aead.c:210 [inline]
BUG: KASAN: use-after-free in aead_recvmsg+0x1552/0x1970 crypto/algif_aead.c:313
Read of size 4 at addr ffff8801c7471b5c by task syzkaller018329/3350

CPU: 0 PID: 3350 Comm: syzkaller018329 Not tainted 4.14.0-mm1+ #25
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
 skcipher_request_set_tfm include/crypto/skcipher.h:499 [inline]
 crypto_aead_copy_sgl crypto/algif_aead.c:85 [inline]
 _aead_recvmsg crypto/algif_aead.c:210 [inline]
 aead_recvmsg+0x1552/0x1970 crypto/algif_aead.c:313
 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
BUG: unable to handle kernel NULL pointer dereference at           (null)
IP:           (null)
PGD 1c6b11067 P4D 1c6b11067 PUD 1c6b07067 PMD 0 
Oops: 0010 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 3367 Comm: syzkaller018329 Not tainted 4.14.0-mm1+ #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c64b84c0 task.stack: ffff8801c6738000
RIP: 0010:          (null)
RSP: 0018:ffff8801c673f960 EFLAGS: 00010292
RAX: ffff8801c7471b40 RBX: 1ffff10038ce7f2d RCX: ffffffff823ad4d9
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8801c673f968
RBP: ffff8801c673fb00 R08: 0000000000000000 R09: ffff8801cbf24910
R10: 0000000000000008 R11: ffffed00397e4929 R12: dffffc0000000000
R13: ffff8801c7471b68 R14: ffff8801c6668a80 R15: ffff8801cbf24900
FS:  00007f487260c700(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001c6e70000 CR4: 00000000001406e0
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: 0033:0x44a6f9
RSP: 002b:00007f487260bdc8 EFLAGS: 00000202 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044a6f9
RDX: 0000000000000040 RSI: 00000000207e0000 RDI: 0000000000000006
RBP: 0000000000000086 R08: 00007f487260c700 R09: 00007f487260c700
R10: 00007f487260c700 R11: 0000000000000202 R12: 0000000000000000
R13: 00007fff1ceab94f R14: 00007f487260c9c0 R15: 0000000000000000
Code:  Bad RIP value.
RIP:           (null) RSP: ffff8801c673f960
CR2: 0000000000000000
---[ end trace 560ffe56058d119e ]---