BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x305b/0x3190 net/xfrm/xfrm_state.c:1051 Read of size 4 at addr ffff88006a1ffaf8 by task syzkaller926653/3036 CPU: 1 PID: 3036 Comm: syzkaller926653 Not tainted 4.13.0-rc6-next-20170825+ #9 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 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+0x24e/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+0x2fb/0xbd0 net/xfrm/xfrm_policy.c:1432 xfrm_resolve_and_create_bundle+0x186/0x24b0 net/xfrm/xfrm_policy.c:1830 xfrm_lookup+0xefb/0x2540 net/xfrm/xfrm_policy.c:2141 xfrm_lookup_route+0x39/0x1a0 net/xfrm/xfrm_policy.c:2260 ip_route_output_flow+0x7c/0xa0 net/ipv4/route.c:2549 raw_sendmsg+0xc4b/0x38b0 net/ipv4/raw.c:633 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: 0033:0x435129 RSP: 002b:00007ffdd879daa8 EFLAGS: 00000217 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00000000004002b0 RCX: 0000000000435129 RDX: 0000000000000000 RSI: 0000000020fdbfc0 RDI: 0000000000000003 RBP: 0000000000000086 R08: 0000000020fdbff0 R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000000000 R13: 0000000000401aa0 R14: 0000000000401b30 R15: 0000000000000000 The buggy address belongs to the page: page:ffffea0001a87fc0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x500000000000000() raw: 0500000000000000 0000000000000000 0000000000000000 00000000ffffffff raw: 0000000000000000 ffffea0001a87fe0 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88006a1ff980: f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2 00 00 00 f2 ffff88006a1ffa00: f2 f2 f2 f2 00 00 00 00 f2 f2 f2 f2 00 00 00 00 >ffff88006a1ffa80: 00 00 f2 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 f2 ^ ffff88006a1ffb00: f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 f2 f2 f2 ffff88006a1ffb80: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 f1 f1 ==================================================================