audit: type=1326 audit(1535300555.414:2): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=7747 comm="syz-executor1" exe="/root/syz-executor1" sig=9 arch=40000003 syscall=240 compat=1 ip=0xf77bebe9 code=0x0
==================================================================
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 ffff8801bb907b3c by task syz-executor7/7772

CPU: 1 PID: 7772 Comm: syz-executor7 Not tainted 4.4.152-ge5c5f1f #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 5c317f36a766c69b ffff8801bb907a18 ffffffff81e15fed
 ffffea0006ee41c0 ffff8801bb907b3c 0000000000000000 ffff8801bb907b3c
 ffff8801bb907c20 ffff8801bb907a50 ffffffff8151b489 ffff8801bb907b3c
Call Trace:
 [<ffffffff81e15fed>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81e15fed>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8151b489>] print_address_description+0x6c/0x216 mm/kasan/report.c:252
 [<ffffffff8151b7a8>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8151b7a8>] kasan_report.cold.7+0x175/0x2f7 mm/kasan/report.c:408
 [<ffffffff814fe6d4>] __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:426
 [<ffffffff81e32ff1>] strlen lib/string.c:481 [inline]
 [<ffffffff81e32ff1>] strlcpy+0x101/0x120 lib/string.c:141
 [<ffffffff83167bee>] xt_copy_counters_from_user+0x13e/0x2e0 net/netfilter/x_tables.c:879
 [<ffffffff8352bf26>] do_add_counters+0x96/0x5c0 net/ipv6/netfilter/ip6_tables.c:1343
 [<ffffffff8352c526>] compat_do_ip6t_set_ctl+0xd6/0x140 net/ipv6/netfilter/ip6_tables.c:1736
 [<ffffffff830cfdeb>] compat_nf_sockopt net/netfilter/nf_sockopt.c:143 [inline]
 [<ffffffff830cfdeb>] compat_nf_setsockopt+0x8b/0x130 net/netfilter/nf_sockopt.c:155
 [<ffffffff8348d23d>] compat_ipv6_setsockopt+0x15d/0x1d0 net/ipv6/ipv6_sockglue.c:940
 [<ffffffff832390b7>] inet_csk_compat_setsockopt+0x97/0x120 net/ipv4/inet_connection_sock.c:914
 [<ffffffff8324d96d>] compat_tcp_setsockopt+0x3d/0x70 net/ipv4/tcp.c:2654
 [<ffffffff82f2da24>] compat_sock_common_setsockopt+0xb4/0x150 net/core/sock.c:2670
 [<ffffffff830146bc>] C_SYSC_setsockopt net/compat.c:385 [inline]
 [<ffffffff830146bc>] 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
 [<ffffffff838cdec3>] sysenter_flags_fixed+0xd/0x1a

The buggy address belongs to the page:
page:ffffea0006ee41c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801bb907a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801bb907a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1
>ffff8801bb907b00: f1 f1 f1 00 00 00 00 04 f2 f2 f2 00 00 00 00 00
                                        ^
 ffff8801bb907b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801bb907c00: f1 f1 f1 f1 00 00 00 00 00 f2 f2 f2 00 00 00 00
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