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BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x303d/0x3170 net/xfrm/xfrm_state.c:1051
Read of size 4 at addr ffff88010a97faf8 by task syz-executor2/31362

CPU: 0 PID: 31362 Comm: syz-executor2 Not tainted 4.14.0-rc7+ #109
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+0x303d/0x3170 net/xfrm/xfrm_state.c:1051
 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1387 [inline]
 xfrm_tmpl_resolve+0x309/0xc00 net/xfrm/xfrm_policy.c:1431
 xfrm_resolve_and_create_bundle+0x186/0x24a0 net/xfrm/xfrm_policy.c:1829
 xfrm_lookup+0x1574/0x23f0 net/xfrm/xfrm_policy.c:2139
 xfrm_lookup_route+0x39/0x1a0 net/xfrm/xfrm_policy.c:2257
 ip_route_output_flow+0x7c/0xa0 net/ipv4/route.c:2555
 raw_sendmsg+0xc4f/0x3920 net/ipv4/raw.c:633
 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763
 sock_sendmsg_nosec net/socket.c:633 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:643
 SYSC_sendto+0x352/0x5a0 net/socket.c:1750
 SyS_sendto+0x40/0x50 net/socket.c:1718
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x452869
RSP: 002b:00007fa73e250be8 EFLAGS: 00000212 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452869
RDX: 0000000000000002 RSI: 0000000020fdbfc0 RDI: 0000000000000014
RBP: 00000000000004f0 R08: 0000000020fdbff0 R09: 0000000000000010
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f5720
R13: 00000000ffffffff R14: 00007fa73e2516d4 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea00042a5fc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x200000000000000()
raw: 0200000000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 dead000000000200 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88010a97f980: f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2 00 00 00 f2
 ffff88010a97fa00: f2 f2 f2 f2 00 00 00 00 f2 f2 f2 f2 00 00 00 00
>ffff88010a97fa80: 00 00 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 f2
                                                                ^
 ffff88010a97fb00: f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 f2 f2 f2
 ffff88010a97fb80: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 f1 f1
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