================================================================== 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 ffff8801c8dafadc by task syzkaller346683/3335 CPU: 1 PID: 3335 Comm: syzkaller346683 Not tainted 4.9.71-g2506378 #9 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801c8daf9b8 ffffffff81d922b9 ffffea0007236bc0 ffff8801c8dafadc 0000000000000000 ffff8801c8dafadc ffff8801c8dafbc0 ffff8801c8daf9f0 ffffffff8153bab3 ffff8801c8dafadc 0000000000000001 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_address_description+0x73/0x280 mm/kasan/report.c:252 [] kasan_report_error mm/kasan/report.c:351 [inline] [] kasan_report+0x275/0x360 mm/kasan/report.c:408 [] __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:426 [] strlen lib/string.c:481 [inline] [] strlcpy+0x101/0x120 lib/string.c:141 [] xt_copy_counters_from_user+0x163/0x2e0 net/netfilter/x_tables.c:844 [] do_add_counters+0x96/0x590 net/ipv6/netfilter/ip6_tables.c:1213 [] compat_do_ipt_set_ctl+0xbf/0x150 net/ipv4/netfilter/ip_tables.c:1567 [] compat_nf_sockopt net/netfilter/nf_sockopt.c:143 [inline] [] compat_nf_setsockopt+0x88/0x130 net/netfilter/nf_sockopt.c:155 [] compat_ip_setsockopt+0x9d/0xf0 net/ipv4/ip_sockglue.c:1277 [] compat_udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2093 [] compat_ipv6_setsockopt+0xb2/0x1e0 net/ipv6/ipv6_sockglue.c:928 [] inet_csk_compat_setsockopt+0x95/0x120 net/ipv4/inet_connection_sock.c:914 [] compat_tcp_setsockopt+0x3d/0x70 net/ipv4/tcp.c:2747 [] compat_sock_common_setsockopt+0xb2/0x140 net/core/sock.c:2717 [] C_SYSC_setsockopt net/compat.c:398 [inline] [] compat_SyS_setsockopt+0x149/0x290 net/compat.c:381 [] do_syscall_32_irqs_on arch/x86/entry/common.c:322 [inline] [] do_fast_syscall_32+0x2f7/0x890 arch/x86/entry/common.c:384 [] entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124 The buggy address belongs to the page: page:ffffea0007236bc0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x8000000000000000() page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c8daf980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801c8dafa00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801c8dafa80: 00 00 00 f1 f1 f1 f1 00 00 00 00 04 f2 f2 f2 00 ^ ffff8801c8dafb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801c8dafb80: 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00 f2 f2 f2 ==================================================================