audit: type=1400 audit(1514131069.782:7): avc:  denied  { map } for  pid=3146 comm="syzkaller494321" path="/root/syzkaller494321498" 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:1050
Read of size 4 at addr ffff8801c99d7740 by task syzkaller494321/3146

CPU: 0 PID: 3146 Comm: syzkaller494321 Not tainted 4.15.0-rc4+ #164
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:1050
 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1388 [inline]
 xfrm_tmpl_resolve+0x30e/0xc10 net/xfrm/xfrm_policy.c:1432
 xfrm_resolve_and_create_bundle+0x134/0x2760 net/xfrm/xfrm_policy.c:1823
 xfrm_lookup+0x156b/0x23e0 net/xfrm/xfrm_policy.c:2148
 xfrm_lookup_route+0x39/0x1a0 net/xfrm/xfrm_policy.c:2266
 ip_route_output_flow+0x7c/0xa0 net/ipv4/route.c:2559
 udp_sendmsg+0x19d3/0x2ce0 net/ipv4/udp.c:999
 udpv6_sendmsg+0x762/0x33a0 net/ipv6/udp.c:1156
 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:628 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:638
 SYSC_sendto+0x361/0x5c0 net/socket.c:1719
 SyS_sendto+0x40/0x50 net/socket.c:1687
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x43ff29
RSP: 002b:00007ffe4c5b3d28 EFLAGS: 00000217 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0100000000000000 RCX: 000000000043ff29
RDX: 0000000000000000 RSI: 000000002028a000 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000020999000 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401890
R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:00000000fcab11d7 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: dead000000000100 dead000000000200 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c99d7600: f1 04 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2
 ffff8801c99d7680: f2 f8 f2 f2 f2 f2 f2 f2 f2 00 00 00 00 f2 f2 f2
>ffff8801c99d7700: f2 00 00 00 00 00 00 00 f2 f2 f2 f2 f2 00 00 00
                                           ^
 ffff8801c99d7780: 00 00 00 00 00 00 f2 f2 f2 00 00 00 00 00 00 00
 ffff8801c99d7800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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