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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 ffff8801d031facc by task syz-executor3/10606

CPU: 1 PID: 10606 Comm: syz-executor3 Not tainted 4.4.156+ #35
 0000000000000000 fc2fbf96a905cd8c ffff8801d031f9a8 ffffffff81a557bd
 ffffea000740c7c0 ffff8801d031facc 0000000000000000 ffff8801d031facc
 ffff8801d031fbb0 ffff8801d031f9e0 ffffffff8146c8c9 ffff8801d031facc
Call Trace:
 [<ffffffff81a557bd>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81a557bd>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8146c8c9>] print_address_description+0x6c/0x217 mm/kasan/report.c:252
 [<ffffffff8146cbe9>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8146cbe9>] kasan_report.cold.6+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff81461a94>] __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:426
 [<ffffffff81a71a61>] strlen lib/string.c:481 [inline]
 [<ffffffff81a71a61>] strlcpy+0x101/0x120 lib/string.c:141
 [<ffffffff822ec21e>] xt_copy_counters_from_user+0x13e/0x2e0 net/netfilter/x_tables.c:879
 [<ffffffff8249d056>] do_add_counters+0x96/0x5b0 net/ipv4/netfilter/ip_tables.c:1332
 [<ffffffff824a26b6>] compat_do_ipt_set_ctl+0xd6/0x140 net/ipv4/netfilter/ip_tables.c:1735
 [<ffffffff8227bbab>] compat_nf_sockopt net/netfilter/nf_sockopt.c:143 [inline]
 [<ffffffff8227bbab>] compat_nf_setsockopt+0x8b/0x130 net/netfilter/nf_sockopt.c:155
 [<ffffffff82357957>] compat_ip_setsockopt+0x97/0xd0 net/ipv4/ip_sockglue.c:1254
 [<ffffffff823fd6aa>] compat_udp_setsockopt+0x4a/0x90 net/ipv4/udp.c:2172
 [<ffffffff8257a0e4>] compat_ipv6_setsockopt+0xb4/0x1d0 net/ipv6/ipv6_sockglue.c:923
 [<ffffffff8258ee9a>] compat_udpv6_setsockopt+0x4a/0x90 net/ipv6/udp.c:1446
 [<ffffffff82161f44>] compat_sock_common_setsockopt+0xb4/0x150 net/core/sock.c:2670
 [<ffffffff8222c879>] C_SYSC_setsockopt net/compat.c:385 [inline]
 [<ffffffff8222c879>] 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
 [<ffffffff82692510>] sysenter_flags_fixed+0xd/0x1a

The buggy address belongs to the page:
page:ffffea000740c7c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d031f980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801d031fa00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8801d031fa80: 00 f1 f1 f1 f1 00 00 00 00 04 f2 f2 f2 00 00 00
                                              ^
 ffff8801d031fb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801d031fb80: 00 00 f1 f1 f1 f1 00 00 00 00 00 f2 f2 f2 00 00
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