audit: type=1400 audit(1512820373.446:7): avc:  denied  { map } for  pid=3147 comm="syzkaller165057" path="/root/syzkaller165057384" 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+0x30fc/0x3230 net/xfrm/xfrm_state.c:1050
Read of size 4 at addr ffff8801c46bf5c0 by task syzkaller165057/3147

CPU: 0 PID: 3147 Comm: syzkaller165057 Not tainted 4.15.0-rc2+ #124
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+0x30fc/0x3230 net/xfrm/xfrm_state.c:1050
 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1388 [inline]
 xfrm_tmpl_resolve+0x309/0xc00 net/xfrm/xfrm_policy.c:1432
 xfrm_resolve_and_create_bundle+0x11b/0x2600 net/xfrm/xfrm_policy.c:1821
 xfrm_lookup+0x1574/0x23f0 net/xfrm/xfrm_policy.c:2146
 xfrm_lookup_route+0x39/0x1a0 net/xfrm/xfrm_policy.c:2264
 ip_route_output_flow+0x7c/0xa0 net/ipv4/route.c:2559
 udp_sendmsg+0x19b8/0x2cd0 net/ipv4/udp.c:1019
 udpv6_sendmsg+0x743/0x3380 net/ipv6/udp.c:1186
 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763
 sock_sendmsg_nosec net/socket.c:636 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:646
 SYSC_sendto+0x358/0x5a0 net/socket.c:1727
 SyS_sendto+0x40/0x50 net/socket.c:1695
 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7ffbc79
RSP: 002b:00000000ffc63c1c EFLAGS: 00000286 ORIG_RAX: 0000000000000171
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000002028a000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020999000
RBP: 000000000000001c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:000000008c25921c count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c46bf480: f1 04 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2
 ffff8801c46bf500: f2 f8 f2 f2 f2 f2 f2 f2 f2 00 00 00 00 f2 f2 f2
>ffff8801c46bf580: f2 00 00 00 00 00 00 00 f2 f2 f2 f2 f2 00 00 00
                                           ^
 ffff8801c46bf600: 00 00 00 00 00 00 f2 f2 f2 f3 f3 f3 f3 00 00 00
 ffff8801c46bf680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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