================================================================== BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x30de/0x3210 net/xfrm/xfrm_state.c:1051 Read of size 4 at addr ffff8801c17275d0 by task syz-executor4/15883 CPU: 0 PID: 15883 Comm: syz-executor4 Not tainted 4.15.0-rc7-next-20180111+ #94 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:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23b/0x360 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 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+0x15b2/0x24f0 net/xfrm/xfrm_policy.c:2156 xfrm_lookup_route+0x39/0x1a0 net/xfrm/xfrm_policy.c:2274 ip_route_output_flow+0x7c/0xa0 net/ipv4/route.c:2559 udp_sendmsg+0x19d3/0x2ce0 net/ipv4/udp.c:999 udpv6_sendmsg+0x757/0x3400 net/ipv6/udp.c:1156 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764 sock_sendmsg_nosec net/socket.c:628 [inline] sock_sendmsg+0xca/0x110 net/socket.c:638 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2018 __sys_sendmsg+0xe5/0x210 net/socket.c:2052 SYSC_sendmsg net/socket.c:2063 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2059 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452ac9 RSP: 002b:00007f945058cc58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f945058d700 RCX: 0000000000452ac9 RDX: 0000000000000000 RSI: 00000000201f1000 RDI: 0000000000000013 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 R13: 0000000000a2f7ef R14: 00007f945058d9c0 R15: 0000000000000000 The buggy address belongs to the page: page:ffffea000705c9c0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x2fffc0000000000() raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff raw: 0000000000000000 dead000000000101 ffff8801c1bd5160 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c1727480: f1 f1 f1 04 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 ffff8801c1727500: f2 f2 f2 f8 f2 f2 f2 f2 f2 f2 f2 00 00 00 00 f2 >ffff8801c1727580: f2 f2 f2 00 00 00 00 00 00 00 f2 f2 f2 f2 f2 00 ^ ffff8801c1727600: 00 00 00 00 00 00 00 00 f2 f2 f2 00 00 00 00 00 ffff8801c1727680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================