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BUG: KASAN: stack-out-of-bounds in __xfrm6_daddr_saddr_hash net/xfrm/xfrm_hash.h:29 [inline]
BUG: KASAN: stack-out-of-bounds in __xfrm_dst_hash net/xfrm/xfrm_hash.h:96 [inline]
BUG: KASAN: stack-out-of-bounds in xfrm_dst_hash net/xfrm/xfrm_state.c:60 [inline]
BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x27f9/0x2880 net/xfrm/xfrm_state.c:953
Read of size 4 at addr ffff88819a4b7680 by task syz-executor5/21549

CPU: 0 PID: 21549 Comm: syz-executor5 Not tainted 4.14.85+ #15
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0xb9/0x11b lib/dump_stack.c:53
 print_address_description+0x60/0x22b mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report.cold.6+0x11b/0x2dd mm/kasan/report.c:409
 __xfrm6_daddr_saddr_hash net/xfrm/xfrm_hash.h:29 [inline]
 __xfrm_dst_hash net/xfrm/xfrm_hash.h:96 [inline]
 xfrm_dst_hash net/xfrm/xfrm_state.c:60 [inline]
 xfrm_state_find+0x27f9/0x2880 net/xfrm/xfrm_state.c:953
 xfrm_tmpl_resolve_one+0x1c6/0x7f0 net/xfrm/xfrm_policy.c:1416
 xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:1461 [inline]
 xfrm_resolve_and_create_bundle+0x21a/0x2550 net/xfrm/xfrm_policy.c:1857
 xfrm_lookup_with_ifid+0x246/0x1870 net/xfrm/xfrm_policy.c:2202
 xfrm_lookup net/xfrm/xfrm_policy.c:2327 [inline]
 xfrm_lookup_route+0x37/0x1b0 net/xfrm/xfrm_policy.c:2338
 ip_route_output_flow+0x86/0xa0 net/ipv4/route.c:2563
 udp_sendmsg+0x1377/0x1da0 net/ipv4/udp.c:1021
 udpv6_sendmsg+0x125f/0x2510 net/ipv6/udp.c:1193
 inet_sendmsg+0x168/0x540 net/ipv4/af_inet.c:781
 sock_sendmsg_nosec net/socket.c:645 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:655
 ___sys_sendmsg+0x41d/0x890 net/socket.c:2061
 __sys_sendmmsg+0x13d/0x360 net/socket.c:2151
 SYSC_sendmmsg net/socket.c:2182 [inline]
 SyS_sendmmsg+0x2f/0x50 net/socket.c:2177
 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x457569
RSP: 002b:00007f1c31775c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457569
RDX: 0000000000000002 RSI: 0000000020000100 RDI: 0000000000000003
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1c317766d4
R13: 00000000004c3c33 R14: 00000000004d63e8 R15: 00000000ffffffff

The buggy address belongs to the page:
page:ffffea0006692dc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000000()
raw: 4000000000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 dead000000000200 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88819a4b7580: 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 f2 f2 f2
 ffff88819a4b7600: f2 00 00 00 00 f2 f2 f2 f2 00 00 00 00 00 00 00
>ffff88819a4b7680: f2 f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 f2 f2
                   ^
 ffff88819a4b7700: f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88819a4b7780: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2
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