netlink: 4 bytes leftover after parsing attributes in process `syz-executor0'. ================================================================== BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x30de/0x3210 net/xfrm/xfrm_state.c:1051 Read of size 4 at addr ffff8801bbdd7480 by task syz-executor2/24948 CPU: 0 PID: 24948 Comm: syz-executor2 Not tainted 4.16.0-rc4+ #254 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+0x194/0x24d 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+0x23c/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+0xfcb/0x25c0 net/xfrm/xfrm_policy.c:2160 xfrm_lookup_route+0x39/0x1a0 net/xfrm/xfrm_policy.c:2280 ip_route_output_flow+0x7c/0xa0 net/ipv4/route.c:2560 udp_sendmsg+0x19bd/0x2f70 net/ipv4/udp.c:1012 udpv6_sendmsg+0x757/0x3400 net/ipv6/udp.c:1156 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763 sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xca/0x110 net/socket.c:639 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2047 __sys_sendmsg+0xe5/0x210 net/socket.c:2081 SYSC_sendmsg net/socket.c:2092 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2088 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453e69 RSP: 002b:00007f1ab325cc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f1ab325d6d4 RCX: 0000000000453e69 RDX: 0000000000000000 RSI: 0000000020000580 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004b9 R14: 00000000006f71f8 R15: 0000000000000000 The buggy address belongs to the page: page:ffffea0006ef75c0 count:0 mapcount:0 mapping:0000000000000000 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: ffff8801bbdd7380: f2 00 f2 f2 f2 f2 f2 f2 f2 f8 f2 f2 f2 f2 f2 f2 ffff8801bbdd7400: f2 00 00 00 00 f2 f2 f2 f2 00 00 00 00 00 00 00 >ffff8801bbdd7480: f2 f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 f2 f2 ^ ffff8801bbdd7500: f2 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801bbdd7580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 ==================================================================