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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 ffff8800a6977afc by task syz-executor5/4057

CPU: 1 PID: 4057 Comm: syz-executor5 Not tainted 4.4.153+ #29
 0000000000000000 36168373063f4bdf ffff8800a69779d8 ffffffff81a5490d
 ffffea00029a5dc0 ffff8800a6977afc 0000000000000000 ffff8800a6977afc
 ffff8800a6977be0 ffff8800a6977a10 ffffffff8146c1c9 ffff8800a6977afc
Call Trace:
 [<ffffffff81a5490d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81a5490d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8146c1c9>] print_address_description+0x6c/0x217 mm/kasan/report.c:252
 [<ffffffff8146c4e9>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8146c4e9>] kasan_report.cold.6+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff81461394>] __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:426
 [<ffffffff81a70bb1>] strlen lib/string.c:481 [inline]
 [<ffffffff81a70bb1>] strlcpy+0x101/0x120 lib/string.c:141
 [<ffffffff822eb21e>] xt_copy_counters_from_user+0x13e/0x2e0 net/netfilter/x_tables.c:879
 [<ffffffff826022c6>] do_add_counters+0x96/0x5c0 net/ipv6/netfilter/ip6_tables.c:1343
 [<ffffffff82607ba6>] compat_do_ip6t_set_ctl+0xd6/0x140 net/ipv6/netfilter/ip6_tables.c:1736
 [<ffffffff8227abab>] compat_nf_sockopt net/netfilter/nf_sockopt.c:143 [inline]
 [<ffffffff8227abab>] compat_nf_setsockopt+0x8b/0x130 net/netfilter/nf_sockopt.c:155
 [<ffffffff8257911d>] compat_ipv6_setsockopt+0x15d/0x1d0 net/ipv6/ipv6_sockglue.c:940
 [<ffffffff8235f997>] inet_csk_compat_setsockopt+0x97/0x120 net/ipv4/inet_connection_sock.c:914
 [<ffffffff823738dd>] compat_tcp_setsockopt+0x3d/0x70 net/ipv4/tcp.c:2654
 [<ffffffff82160f44>] compat_sock_common_setsockopt+0xb4/0x150 net/core/sock.c:2670
 [<ffffffff8222b879>] C_SYSC_setsockopt net/compat.c:385 [inline]
 [<ffffffff8222b879>] compat_SyS_setsockopt+0x169/0x6e0 net/compat.c:368
 [<ffffffff81005ffe>] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline]
 [<ffffffff81005ffe>] do_fast_syscall_32+0x31e/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff82691490>] sysenter_flags_fixed+0xd/0x1a

The buggy address belongs to the page:
page:ffffea00029a5dc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x0()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8800a6977980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8800a6977a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8800a6977a80: 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 04
                                                                ^
 ffff8800a6977b00: f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8800a6977b80: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00
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