BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x305b/0x3190 net/xfrm/xfrm_state.c:1051 Read of size 4 at addr ffff8801d0377af8 by task syzkaller124001/2982 CPU: 1 PID: 2982 Comm: syzkaller124001 Not tainted 4.14.0-rc2-next-20170928+ #31 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 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+0x305b/0x3190 net/xfrm/xfrm_state.c:1051 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+0x186/0x24b0 net/xfrm/xfrm_policy.c:1830 xfrm_lookup+0xf0a/0x2540 net/xfrm/xfrm_policy.c:2141 xfrm_lookup_route+0x39/0x1a0 net/xfrm/xfrm_policy.c:2259 ip_route_output_flow+0x7c/0xa0 net/ipv4/route.c:2549 udp_sendmsg+0x19b8/0x2cd0 net/ipv4/udp.c:1022 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:633 [inline] sock_sendmsg+0xca/0x110 net/socket.c:643 SYSC_sendto+0x358/0x5a0 net/socket.c:1750 SyS_sendto+0x40/0x50 net/socket.c:1718 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x43fee9 RSP: 002b:00007ffca1bb87d8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fee9 RDX: 0000000000000000 RSI: 000000002010affe RDI: 0000000000000003 RBP: 0000000000000086 R08: 00000000202f9000 R09: 0000000000000010 R10: 000000002004487c R11: 0000000000000217 R12: 0000000000401850 R13: 00000000004018e0 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the page: page:ffffea000740ddc0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x200000000000000() raw: 0200000000000000 0000000000000000 0000000000000000 00000000ffffffff raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d0377980: 00 00 00 00 f1 f1 f1 f1 04 f2 f2 f2 f2 f2 f2 f2 ffff8801d0377a00: 00 f2 f2 f2 f2 f2 f2 f2 f8 f2 f2 f2 f2 f2 f2 f2 >ffff8801d0377a80: 00 00 00 00 f2 f2 f2 f2 00 00 00 00 00 00 00 f2 ^ ffff8801d0377b00: f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 f2 f2 f2 ffff8801d0377b80: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 f1 f1 ==================================================================