syzbot

IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready
8021q: adding VLAN 0 to HW filter on device team0
IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
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BUG: KASAN: stack-out-of-bounds in strlcpy include/linux/string.h:300 [inline]
BUG: KASAN: stack-out-of-bounds in compat_mtw_from_user net/bridge/netfilter/ebtables.c:1957 [inline]
BUG: KASAN: stack-out-of-bounds in ebt_size_mwt net/bridge/netfilter/ebtables.c:2059 [inline]
BUG: KASAN: stack-out-of-bounds in size_entry_mwt net/bridge/netfilter/ebtables.c:2155 [inline]
BUG: KASAN: stack-out-of-bounds in compat_copy_entries+0x96c/0x14a0 net/bridge/netfilter/ebtables.c:2194
Write of size 33 at addr ffff8801d960f888 by task syz-executor0/4737

CPU: 1 PID: 4737 Comm: syz-executor0 Not tainted 4.17.0-rc7+ #103
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1b9/0x294 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 memcpy+0x37/0x50 mm/kasan/kasan.c:303
 strlcpy include/linux/string.h:300 [inline]
 compat_mtw_from_user net/bridge/netfilter/ebtables.c:1957 [inline]
 ebt_size_mwt net/bridge/netfilter/ebtables.c:2059 [inline]
 size_entry_mwt net/bridge/netfilter/ebtables.c:2155 [inline]
 compat_copy_entries+0x96c/0x14a0 net/bridge/netfilter/ebtables.c:2194
 compat_do_replace+0x483/0x900 net/bridge/netfilter/ebtables.c:2285
 compat_do_ebt_set_ctl+0x2ac/0x324 net/bridge/netfilter/ebtables.c:2367
 compat_nf_sockopt net/netfilter/nf_sockopt.c:144 [inline]
 compat_nf_setsockopt+0x9b/0x140 net/netfilter/nf_sockopt.c:156
 compat_ip_setsockopt+0xff/0x140 net/ipv4/ip_sockglue.c:1277
 inet_csk_compat_setsockopt+0x97/0x120 net/ipv4/inet_connection_sock.c:1041
 compat_tcp_setsockopt+0x49/0x80 net/ipv4/tcp.c:2902
 compat_sock_common_setsockopt+0xb4/0x150 net/core/sock.c:3050
 __compat_sys_setsockopt+0x1ab/0x840 net/compat.c:404
 __do_compat_sys_setsockopt net/compat.c:417 [inline]
 __se_compat_sys_setsockopt net/compat.c:414 [inline]
 __ia32_compat_sys_setsockopt+0xbd/0x150 net/compat.c:414
 do_syscall_32_irqs_on arch/x86/entry/common.c:323 [inline]
 do_fast_syscall_32+0x345/0xf9b arch/x86/entry/common.c:394
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f3acb9
RSP: 002b:00000000ffb028cc EFLAGS: 00000282 ORIG_RAX: 000000000000016e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000080 RSI: 0000000020000040 RDI: 0000000000000554
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea00076583c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x2fffc0000000000()
raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 ffffea0007650101 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d960f780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801d960f800: 00 00 00 00 00 f1 f1 f1 f1 00 00 f2 f2 f2 f2 f2
>ffff8801d960f880: f2 00 00 00 07 f3 f3 f3 f3 00 00 00 00 00 00 00
                               ^
 ffff8801d960f900: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00
 ffff8801d960f980: 00 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 00
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