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BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x2453/0x2830 net/xfrm/xfrm_state.c:822
Read of size 4 at addr ffff8801d908f730 by task syzkaller030320/3765

CPU: 0 PID: 3765 Comm: syzkaller030320 Not tainted 4.9.92-g9c3fb9c #70
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d908ed80 ffffffff81d95109 ffffea00076423c0 ffff8801d908f730
 0000000000000000 ffff8801d908f730 ffff8801bf356b20 ffff8801d908edb8
 ffffffff8153d5d3 ffff8801d908f730 0000000000000004 0000000000000000
Call Trace:
 [<ffffffff81d95109>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d95109>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153d5d3>] print_address_description+0x73/0x280 mm/kasan/report.c:256
 [<ffffffff8153dad5>] kasan_report_error mm/kasan/report.c:355 [inline]
 [<ffffffff8153dad5>] kasan_report+0x255/0x380 mm/kasan/report.c:412
 [<ffffffff8153dc54>] __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432
 [<ffffffff833de8b3>] xfrm_state_find+0x2453/0x2830 net/xfrm/xfrm_state.c:822
 [<ffffffff833c3af8>] xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1483 [inline]
 [<ffffffff833c3af8>] xfrm_tmpl_resolve+0x298/0xa90 net/xfrm/xfrm_policy.c:1527
 [<ffffffff833c43c7>] xfrm_resolve_and_create_bundle+0xd7/0x1d90 net/xfrm/xfrm_policy.c:1875
 [<ffffffff833c9cd4>] xfrm_lookup+0x984/0xbf0 net/xfrm/xfrm_policy.c:2229
 [<ffffffff833cae39>] xfrm_lookup_route+0x39/0x1a0 net/xfrm/xfrm_policy.c:2351
 [<ffffffff831e401f>] ip_route_output_flow+0x7f/0xa0 net/ipv4/route.c:2438
 [<ffffffff832c1c76>] udp_sendmsg+0xe36/0x1c10 net/ipv4/udp.c:1023
 [<ffffffff83492fa8>] udpv6_sendmsg+0x588/0x2540 net/ipv6/udp.c:1086
 [<ffffffff832f553c>] inet_sendmsg+0x2bc/0x4c0 net/ipv4/af_inet.c:770
 [<ffffffff82edabaa>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff82edabaa>] sock_sendmsg+0xca/0x110 net/socket.c:645
 [<ffffffff82edc7c1>] ___sys_sendmsg+0x6d1/0x7e0 net/socket.c:1969
 [<ffffffff82ede7f6>] __sys_sendmsg+0xd6/0x190 net/socket.c:2003
 [<ffffffff82ede8dd>] SYSC_sendmsg net/socket.c:2014 [inline]
 [<ffffffff82ede8dd>] SyS_sendmsg+0x2d/0x50 net/socket.c:2010
 [<ffffffff81006504>] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282
 [<ffffffff838b8593>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

The buggy address belongs to the page:
page:ffffea00076423c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d908f600: 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00
 ffff8801d908f680: f2 f2 f2 f2 f2 f2 f2 00 00 00 00 f2 f2 f2 f2 00
>ffff8801d908f700: 00 00 00 00 00 00 f2 f2 f2 f2 f2 00 00 00 00 00
                                     ^
 ffff8801d908f780: 00 00 00 00 f2 f2 f2 00 00 00 00 00 00 00 00 00
 ffff8801d908f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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