FILE: net/ipv6/tcp_ipv6.c

==================================================================
BUG: KASAN: use-after-free in ip6_dst_store include/net/ip6_fib.h:176 [inline]
BUG: KASAN: use-after-free in tcp_v6_connect+0x1dfd/0x20f0 net/ipv6/tcp_ipv6.c:271
Read of size 4 at addr ffff880066df126c by task syz-executor6/22754

CPU: 0 PID: 22754 Comm: syz-executor6 Not tainted 4.12.0-rc1+ #366
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+0x292/0x395 lib/dump_stack.c:52
 print_address_description+0x73/0x280 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report+0x22b/0x340 mm/kasan/report.c:408
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:428
 ip6_dst_store include/net/ip6_fib.h:176 [inline]
 tcp_v6_connect+0x1dfd/0x20f0 net/ipv6/tcp_ipv6.c:271
 __inet_stream_connect+0x2ee/0xf90 net/ipv4/af_inet.c:618
 inet_stream_connect+0x58/0xa0 net/ipv4/af_inet.c:682
 SYSC_connect+0x251/0x590 net/socket.c:1588
 SyS_connect+0x24/0x30 net/socket.c:1569
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x445e89
RSP: 002b:00007fc98a723b58 EFLAGS: 00000286 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 0000000000000016 RCX: 0000000000445e89
RDX: 000000000000001c RSI: 0000000020066000 RDI: 0000000000000016
RBP: 00000000006e04c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000286 R12: 00000000007081f8
R13: 0000000000000000 R14: 00007fc98a7249c0 R15: 00007fc98a724700