nla_parse: 18 callbacks suppressed netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. ------------[ cut here ]------------ kernel BUG at net/core/dev.c:2913! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 18584 Comm: syz-executor.5 Not tainted 4.19.195-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:skb_checksum_help+0x819/0x9c0 net/core/dev.c:2913 Code: 7c 24 20 e8 d9 c8 23 fb e9 2c fc ff ff e8 0f fc ed fa 48 89 ef 41 bc ea ff ff ff e8 e1 f1 ff ff e9 e8 fc ff ff e8 f7 fb ed fa <0f> 0b e8 f0 fb ed fa 48 8b 54 24 20 48 b8 00 00 00 00 00 fc ff df RSP: 0018:ffff8880a4946fe8 EFLAGS: 00010216 RAX: 0000000000040000 RBX: 0000000000000092 RCX: ffffc90012475000 RDX: 000000000000a7d8 RSI: ffffffff86748339 RDI: 0000000000000004 RBP: ffff8880a1e54700 R08: 0000000000000000 R09: 0000000000000084 R10: 0000000000000004 R11: 0000000000000000 R12: ffff8880a1e54784 R13: ffff8880a1e54790 R14: 0000000000000300 R15: ffff8880a1e54780 FS: 00007f672cbdf700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30d22000 CR3: 0000000097053000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_csum_hwoffload_help+0x8b/0x130 net/core/dev.c:3306 validate_xmit_skb+0x94a/0xd50 net/core/dev.c:3349 __dev_queue_xmit+0x963/0x2e00 net/core/dev.c:3830 neigh_hh_output include/net/neighbour.h:491 [inline] neigh_output include/net/neighbour.h:499 [inline] ip_finish_output2+0xb6d/0x15a0 net/ipv4/ip_output.c:230 ip_finish_output+0x858/0xd20 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_output+0x203/0x5f0 net/ipv4/ip_output.c:406 dst_output include/net/dst.h:455 [inline] ip_local_out+0xaf/0x170 net/ipv4/ip_output.c:125 iptunnel_xmit+0x63b/0x9d0 net/ipv4/ip_tunnel_core.c:91 geneve_xmit_skb drivers/net/geneve.c:867 [inline] geneve_xmit+0x1183/0x2e10 drivers/net/geneve.c:943 x_tables: ip6_tables: CLASSIFY target: used from hooks PREROUTING, but only usable from FORWARD/OUTPUT/POSTROUTING __netdev_start_xmit include/linux/netdevice.h:4345 [inline] netdev_start_xmit include/linux/netdevice.h:4359 [inline] xmit_one net/core/dev.c:3256 [inline] dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272 sch_direct_xmit+0x2d6/0xf50 net/sched/sch_generic.c:332 qdisc_restart net/sched/sch_generic.c:395 [inline] __qdisc_run+0x4d0/0x1640 net/sched/sch_generic.c:403 __dev_xmit_skb net/core/dev.c:3500 [inline] __dev_queue_xmit+0x1518/0x2e00 net/core/dev.c:3807 packet_snd net/packet/af_packet.c:2988 [inline] packet_sendmsg+0x24e9/0x7130 net/packet/af_packet.c:3013 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 __sys_sendto+0x21a/0x320 net/socket.c:1787 __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1795 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f672cbdf188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665d9 RDX: 0000000000003287 RSI: 0000000020000080 RDI: 0000000000000003 xt_CT: You must specify a L4 protocol and not use inversions on it RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 00000000000002ff R10: 0000000004000002 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffddae4e8df R14: 00007f672cbdf300 R15: 0000000000022000 Modules linked in: ---[ end trace 2c45371dd7e745b5 ]--- RIP: 0010:skb_checksum_help+0x819/0x9c0 net/core/dev.c:2913 Code: 7c 24 20 e8 d9 c8 23 fb e9 2c fc ff ff e8 0f fc ed fa 48 89 ef 41 bc ea ff ff ff e8 e1 f1 ff ff e9 e8 fc ff ff e8 f7 fb ed fa <0f> 0b e8 f0 fb ed fa 48 8b 54 24 20 48 b8 00 00 00 00 00 fc ff df RSP: 0018:ffff8880a4946fe8 EFLAGS: 00010216 RAX: 0000000000040000 RBX: 0000000000000092 RCX: ffffc90012475000 RDX: 000000000000a7d8 RSI: ffffffff86748339 RDI: 0000000000000004 RBP: ffff8880a1e54700 R08: 0000000000000000 R09: 0000000000000084 R10: 0000000000000004 R11: 0000000000000000 R12: ffff8880a1e54784 R13: ffff8880a1e54790 R14: 0000000000000300 R15: ffff8880a1e54780 FS: 00007f672cbdf700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30d22000 CR3: 0000000097053000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400