==================================================================
BUG: KASAN: stack-out-of-bounds in strlen lib/string.c:481 [inline]
BUG: KASAN: stack-out-of-bounds in strlcpy+0x101/0x120 lib/string.c:141
Read of size 1 at addr ffff8801ca2679cc by task syz-executor4/15184

CPU: 0 PID: 15184 Comm: syz-executor4 Not tainted 4.4.151-g727cfac #23
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 966fbc530797aa8d ffff8801ca2678a8 ffffffff81e15eed
 ffffea00072899c0 ffff8801ca2679cc 0000000000000000 ffff8801ca2679cc
 ffff8801ca267ab0 ffff8801ca2678e0 ffffffff8151b390 ffff8801ca2679cc
Call Trace:
 [<ffffffff81e15eed>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e15eed>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8151b390>] print_address_description+0x6c/0x216 mm/kasan/report.c:252
 [<ffffffff8151b6af>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8151b6af>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814fe5e4>] __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:426
 [<ffffffff81e32ef1>] strlen lib/string.c:481 [inline]
 [<ffffffff81e32ef1>] strlcpy+0x101/0x120 lib/string.c:141
 [<ffffffff831677ee>] xt_copy_counters_from_user+0x13e/0x2e0 net/netfilter/x_tables.c:879
 [<ffffffff833a9596>] do_add_counters+0x96/0x5c0 net/ipv6/netfilter/ip6_tables.c:1343
 [<ffffffff833aad25>] compat_do_arpt_set_ctl+0x1b5/0x6b0 net/ipv4/netfilter/arp_tables.c:1462
 [<ffffffff830cf9eb>] compat_nf_sockopt net/netfilter/nf_sockopt.c:143 [inline]
 [<ffffffff830cf9eb>] compat_nf_setsockopt+0x8b/0x130 net/netfilter/nf_sockopt.c:155
 [<ffffffff8322fae7>] compat_ip_setsockopt+0xa7/0xe0 net/ipv4/ip_sockglue.c:1254
 [<ffffffff83238cb7>] inet_csk_compat_setsockopt+0x97/0x120 net/ipv4/inet_connection_sock.c:914
 [<ffffffff8324d56d>] compat_tcp_setsockopt+0x3d/0x70 net/ipv4/tcp.c:2654
 [<ffffffff82f2d664>] compat_sock_common_setsockopt+0xb4/0x150 net/core/sock.c:2670
 [<ffffffff830142bc>] C_SYSC_setsockopt net/compat.c:385 [inline]
 [<ffffffff830142bc>] compat_SyS_setsockopt+0x14c/0x2a0 net/compat.c:368
 [<ffffffff81006d94>] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline]
 [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff838cdb83>] sysenter_flags_fixed+0xd/0x1a

The buggy address belongs to the page:
page:ffffea00072899c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801ca267880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801ca267900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801ca267980: 00 f1 f1 f1 f1 00 00 00 00 04 f2 f2 f2 00 00 00
                                              ^
 ffff8801ca267a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801ca267a80: 00 00 f1 f1 f1 f1 00 00 00 00 00 f2 f2 f2 00 00
==================================================================