audit: type=1400 audit(1517389792.525:7): avc:  denied  { map } for  pid=4153 comm="syzkaller910964" path="/root/syzkaller910964761" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
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BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x30de/0x3210 net/xfrm/xfrm_state.c:1051
Read of size 4 at addr ffff8801b3427ad8 by task syzkaller910964/4153

CPU: 0 PID: 4153 Comm: syzkaller910964 Not tainted 4.15.0+ #287
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
 xfrm_state_find+0x30de/0x3210 net/xfrm/xfrm_state.c:1051
 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1393 [inline]
 xfrm_tmpl_resolve+0x2ee/0xc40 net/xfrm/xfrm_policy.c:1437
 xfrm_resolve_and_create_bundle+0x172/0x2760 net/xfrm/xfrm_policy.c:1828
 xfrm_lookup+0xfcb/0x25d0 net/xfrm/xfrm_policy.c:2158
 xfrm_lookup_route+0x39/0x1a0 net/xfrm/xfrm_policy.c:2278
 ip_route_output_flow+0x7c/0xa0 net/ipv4/route.c:2559
 raw_sendmsg+0xcf2/0x3cf0 net/ipv4/raw.c:640
 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763
 sock_sendmsg_nosec net/socket.c:638 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:648
 SYSC_sendto+0x361/0x5c0 net/socket.c:1729
 SyS_sendto+0x40/0x50 net/socket.c:1697
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x43ff69
RSP: 002b:00007ffd86bd9d08 EFLAGS: 00000217 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 000000000043ff69
RDX: 0000000000000000 RSI: 0000000020098000 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000020cf9000 R09: 0000000000000010
R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401890
R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0006cd09c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801b3427980: 00 f2 f2 f2 f2 f2 f2 f2 00 00 00 f2 f2 f2 f2 f2
 ffff8801b3427a00: 00 00 00 00 f2 f2 f2 f2 00 00 00 00 00 00 f2 f2
>ffff8801b3427a80: f2 f2 f2 f2 00 00 00 00 00 00 00 f2 f2 f2 f2 f2
                                                    ^
 ffff8801b3427b00: 00 00 00 00 00 00 00 00 00 f2 f2 f2 00 00 00 00
 ffff8801b3427b80: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2
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