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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 ffff8801d424fad8 by task syz-executor1/1753

CPU: 0 PID: 1753 Comm: syz-executor1 Not tainted 4.15.0-rc9+ #206
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+0x184/0x28d0 net/xfrm/xfrm_policy.c:1830
 xfrm_lookup+0xfcb/0x25c0 net/xfrm/xfrm_policy.c:2160
netlink: 'syz-executor5': attribute type 3 has an invalid length.
 xfrm_lookup_route+0x39/0x1a0 net/xfrm/xfrm_policy.c:2280
 ip_route_output_flow+0x7c/0xa0 net/ipv4/route.c:2556
 raw_sendmsg+0xcbf/0x23b0 net/ipv4/raw.c:640
 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:640
 SYSC_sendto+0x361/0x5c0 net/socket.c:1721
 SyS_sendto+0x40/0x50 net/socket.c:1689
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452f19
RSP: 002b:00007f66200ffc58 EFLAGS: 00000212 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452f19
RDX: 0000000000000000 RSI: 0000000020098000 RDI: 0000000000000013
RBP: 0000000000000510 R08: 0000000020cf9000 R09: 0000000000000010
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f6a20
R13: 00000000ffffffff R14: 00007f66201006d4 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea00075093c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 dead000000000200 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d424f980: f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2 f8 f2 f2 f2
 ffff8801d424fa00: f2 f2 f2 f2 00 00 00 f2 f2 f2 f2 f2 00 00 00 00
>ffff8801d424fa80: f2 f2 f2 f2 00 00 00 00 00 00 00 f2 f2 f2 f2 f2
                                                    ^
 ffff8801d424fb00: 00 00 00 00 00 00 00 00 00 f2 f2 f2 00 00 00 00
 ffff8801d424fb80: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2
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