skb linear: 000000f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 skb linear: 00000100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 skb linear: 00000110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 skb linear: 00000120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ------------[ cut here ]------------ offset+2 (13622) > skb_headlen() (10647) WARNING: CPU: 0 PID: 6164 at net/core/dev.c:3303 skb_checksum_help+0x5c4/0x644 Modules linked in: CPU: 0 PID: 6164 Comm: syz-executor274 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : skb_checksum_help+0x5c4/0x644 lr : skb_checksum_help+0x5c0/0x644 net/core/dev.c:3302 sp : ffff800097956910 x29: ffff800097956930 x28: 0000000000003534 x27: dfff800000000000 x26: 0000000000002997 x25: 000000000000480a x24: 0000000000003536 x23: ffff0000d91e3218 x22: ffff0000d91e31b0 x21: ffff0000d91e3140 x20: 00000000ffffffea x19: 0000000000002997 x18: ffff800097955d80 x17: 0000000000000000 x16: ffff80008aca6b80 x15: 0000000000000001 x14: 1ffff00012f2ac3c x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000402 x10: 0000000000ff0100 x9 : 5b8a057a713b7c00 x8 : 5b8a057a713b7c00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff8000979561f8 x4 : ffff80008ed822c0 x3 : ffff80008036f0d8 x2 : 0000000000000001 x1 : 0000000000000400 x0 : 0000000000000000 Call trace: skb_checksum_help+0x5c4/0x644 skb_csum_hwoffload_help net/core/dev.c:3608 [inline] validate_xmit_skb+0x8cc/0xd10 net/core/dev.c:3651 __dev_queue_xmit+0x1120/0x329c net/core/dev.c:4343 dev_queue_xmit include/linux/netdevice.h:3171 [inline] neigh_hh_output include/net/neighbour.h:526 [inline] neigh_output include/net/neighbour.h:540 [inline] ip_finish_output2+0xdc4/0x1394 net/ipv4/ip_output.c:235 __ip_finish_output+0x1b0/0x458 ip_finish_output+0x44/0x2e4 net/ipv4/ip_output.c:323 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip_output+0x1a8/0x21c net/ipv4/ip_output.c:433 dst_output include/net/dst.h:451 [inline] ip_local_out+0x120/0x160 net/ipv4/ip_output.c:129 iptunnel_xmit+0x428/0x940 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x16cc/0x2630 net/ipv4/ip_tunnel.c:845 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x688/0xa30 net/ipv4/ip_gre.c:665 __netdev_start_xmit include/linux/netdevice.h:4980 [inline] netdev_start_xmit include/linux/netdevice.h:4994 [inline] xmit_one net/core/dev.c:3547 [inline] dev_hard_start_xmit+0x240/0x8ac net/core/dev.c:3563 __dev_queue_xmit+0x15b0/0x329c net/core/dev.c:4351 dev_queue_xmit include/linux/netdevice.h:3171 [inline] packet_xmit+0x6c/0x31c net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3081 [inline] packet_sendmsg+0x3788/0x4c9c net/packet/af_packet.c:3113 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x56c/0x840 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2667 __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2674 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 irq event stamp: 120679 hardirqs last enabled at (120678): [] __up_console_sem kernel/printk/printk.c:341 [inline] hardirqs last enabled at (120678): [] __console_unlock kernel/printk/printk.c:2706 [inline] hardirqs last enabled at (120678): [] console_unlock+0x17c/0x3d4 kernel/printk/printk.c:3038 hardirqs last disabled at (120679): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:470 softirqs last enabled at (120358): [] softirq_handle_end kernel/softirq.c:399 [inline] softirqs last enabled at (120358): [] __do_softirq+0xac8/0xce4 kernel/softirq.c:582 softirqs last disabled at (120380): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]---