kernel msg: ebtables bug: please report to author: Wrong len argument ================================================================== BUG: KASAN: slab-out-of-bounds in nla_strlcpy+0x13d/0x150 lib/nlattr.c:314 Read of size 1 at addr ffff8801b5753011 by task syz-executor4/5984 CPU: 1 PID: 5984 Comm: syz-executor4 Not tainted 4.17.0-rc6+ #74 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 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430 nla_strlcpy+0x13d/0x150 lib/nlattr.c:314 nfnl_acct_new+0x574/0xc50 net/netfilter/nfnetlink_acct.c:118 nfnetlink_rcv_msg+0xd6d/0x1050 net/netfilter/nfnetlink.c:228 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2448 nfnetlink_rcv+0x1b8/0x4b0 net/netfilter/nfnetlink.c:551 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x58b/0x740 net/netlink/af_netlink.c:1336 kernel msg: ebtables bug: please report to author: Wrong len argument netlink_sendmsg+0x9f0/0xfa0 net/netlink/af_netlink.c:1901 kernel msg: ebtables bug: please report to author: Wrong len argument sock_sendmsg_nosec net/socket.c:629 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:639 ___sys_sendmsg+0x805/0x940 net/socket.c:2117 __sys_sendmsg+0x115/0x270 net/socket.c:2155 __do_sys_sendmsg net/socket.c:2164 [inline] __se_sys_sendmsg net/socket.c:2162 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2162 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455a09 RSP: 002b:00007f0f05c3ac68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f0f05c3b6d4 RCX: 0000000000455a09 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000005cf R14: 00000000006fdc08 R15: 0000000000000000 Allocated by task 17: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3554 dst_alloc+0xbb/0x1d0 net/core/dst.c:105 ip6_dst_alloc+0x35/0xa0 net/ipv6/route.c:353 ip6_rt_pcpu_alloc net/ipv6/route.c:1215 [inline] rt6_make_pcpu_route net/ipv6/route.c:1243 [inline] ip6_pol_route+0x6f8/0x1020 net/ipv6/route.c:1909 ip6_pol_route_input+0x62/0x80 net/ipv6/route.c:1925 fib6_rule_lookup+0x129/0x6d0 net/ipv6/fib6_rules.c:118 ip6_route_input_lookup+0xb9/0xd0 net/ipv6/route.c:1937 ip6_route_input+0x769/0xdc0 net/ipv6/route.c:2072 ip6_rcv_finish+0x22a/0xa10 net/ipv6/ip6_input.c:69 NF_HOOK include/linux/netfilter.h:287 [inline] ipv6_rcv+0xeb8/0x2040 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x2468/0x3650 net/core/dev.c:4646 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:4711 process_backlog+0x219/0x760 net/core/dev.c:5391 napi_poll net/core/dev.c:5789 [inline] net_rx_action+0x7b7/0x1930 net/core/dev.c:5855 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285 Freed by task 4548: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x86/0x2d0 mm/slab.c:3756 dst_destroy+0x267/0x3c0 net/core/dst.c:141 dst_destroy_rcu+0x16/0x20 net/core/dst.c:154 __rcu_reclaim kernel/rcu/rcu.h:178 [inline] rcu_do_batch kernel/rcu/tree.c:2675 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2930 [inline] __rcu_process_callbacks kernel/rcu/tree.c:2897 [inline] rcu_process_callbacks+0x941/0x15f0 kernel/rcu/tree.c:2914 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285 The buggy address belongs to the object at ffff8801b5753040 which belongs to the cache ip6_dst_cache of size 240 The buggy address is located 47 bytes to the left of 240-byte region [ffff8801b5753040, ffff8801b5753130) The buggy address belongs to the page: page:ffffea0006d5d4c0 count:1 mapcount:0 mapping:ffff8801b5753040 index:0xffff8801b5753180 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801b5753040 ffff8801b5753180 000000010000000b raw: ffffea0007148520 ffffea00065e5e20 ffff8801cdf2b000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801b5752f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801b5752f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8801b5753000: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. ^ ffff8801b5753080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801b5753100: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ==================================================================