================================================================== BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x30de/0x3210 net/xfrm/xfrm_state.c:1050 Read of size 4 at addr ffff8801bcd3f5d0 by task syz-executor7/16377 CPU: 0 PID: 16377 Comm: syz-executor7 Not tainted 4.15.0-rc7+ #182 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:1050 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1394 [inline] xfrm_tmpl_resolve+0x2ee/0xc40 net/xfrm/xfrm_policy.c:1438 xfrm_resolve_and_create_bundle+0x184/0x28d0 net/xfrm/xfrm_policy.c:1829 xfrm_lookup+0x15b2/0x24f0 net/xfrm/xfrm_policy.c:2155 xfrm_lookup_route+0x39/0x1a0 net/xfrm/xfrm_policy.c:2273 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+0x23/0x9a RIP: 0033:0x452ac9 RSP: 002b:00007f40bb2d1c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452ac9 RDX: 0000000000000000 RSI: 00000000201f1000 RDI: 0000000000000014 RBP: 0000000000000007 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ee148 R13: 00000000ffffffff R14: 00007f40bb2d26d4 R15: 0000000000000002 The buggy address belongs to the page: page:ffffea0006f34fc0 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: ffff8801bcd3f480: f1 f1 f1 04 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 ffff8801bcd3f500: f2 f2 f2 f8 f2 f2 f2 f2 f2 f2 f2 00 00 00 00 f2 >ffff8801bcd3f580: f2 f2 f2 00 00 00 00 00 00 00 f2 f2 f2 f2 f2 00 ^ ffff8801bcd3f600: 00 00 00 00 00 00 00 00 f2 f2 f2 00 00 00 00 00 ffff8801bcd3f680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================