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BUG: KASAN: slab-out-of-bounds in ip6_dst_idev include/net/ip6_fib.h:192 [inline]
BUG: KASAN: slab-out-of-bounds in ip6_xmit+0x1ce9/0x2090 net/ipv6/ip6_output.c:264
Read of size 8 at addr ffff8801d99a1018 by task syzkaller716686/3664

CPU: 0 PID: 3664 Comm: syzkaller716686 Not tainted 4.15.0-rc7+ #187
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_load8_noabort+0x14/0x20 mm/kasan/report.c:430
 ip6_dst_idev include/net/ip6_fib.h:192 [inline]
 ip6_xmit+0x1ce9/0x2090 net/ipv6/ip6_output.c:264
 inet6_csk_xmit+0x2fc/0x580 net/ipv6/inet6_connection_sock.c:139
 tcp_transmit_skb+0x1b1b/0x38c0 net/ipv4/tcp_output.c:1176
 tcp_send_syn_data net/ipv4/tcp_output.c:3457 [inline]
 tcp_connect+0x1edb/0x4090 net/ipv4/tcp_output.c:3496
 tcp_v4_connect+0x15ef/0x1e70 net/ipv4/tcp_ipv4.c:257
 __inet_stream_connect+0x2d4/0xf00 net/ipv4/af_inet.c:620
 tcp_sendmsg_fastopen net/ipv4/tcp.c:1168 [inline]
 tcp_sendmsg_locked+0x264e/0x3c70 net/ipv4/tcp.c:1214
 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1463
 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:630 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:640
 ___sys_sendmsg+0x320/0x8b0 net/socket.c:2020
 __sys_sendmmsg+0x1ee/0x620 net/socket.c:2110
 SYSC_sendmmsg net/socket.c:2141 [inline]
 SyS_sendmmsg+0x35/0x60 net/socket.c:2136
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x43fdd9
RSP: 002b:00007ffcaf235288 EFLAGS: 00000217 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdd9
RDX: 0000000000000001 RSI: 00000000205f8fc8 RDI: 0000000000000004
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000217 R12: 0000000000401740
R13: 00000000004017d0 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 0:
(stack is not available)

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801d99a1000
 which belongs to the cache selinux_inode_security of size 96
The buggy address is located 24 bytes inside of
 96-byte region [ffff8801d99a1000, ffff8801d99a1060)
The buggy address belongs to the page:
page:ffffea0007666840 count:1 mapcount:0 mapping:ffff8801d99a1000 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801d99a1000 0000000000000000 0000000100000020
raw: ffffea00076b61e0 ffffea000756cc60 ffff8801dae27240 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d99a0f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801d99a0f80: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
>ffff8801d99a1000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                            ^
 ffff8801d99a1080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801d99a1100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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