skb linear: 000000b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 skb linear: 000000c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ------------[ cut here ]------------ offset (1639) >= skb_headlen() (1639) WARNING: CPU: 1 PID: 24176 at net/core/dev.c:3326 skb_checksum_help+0x1c0/0x218 net/core/dev.c:3326 Modules linked in: CPU: 1 PID: 24176 Comm: syz.1.8728 Not tainted 6.10.0-syzkaller-04829-ge2f710f97f35 #0 Hardware name: linux,dummy-virt (DT) pstate: 61400009 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) pc : skb_checksum_help+0x1c0/0x218 net/core/dev.c:3326 lr : skb_checksum_help+0x1c0/0x218 net/core/dev.c:3326 sp : ffff80008ccb3420 x29: ffff80008ccb3420 x28: 0000000000000001 x27: 0000000000000000 x26: 000000000000002f x25: ffff800081695f40 x24: 0000000000000000 x23: 0000000000000000 x22: fcf000000737c700 x21: 0000000000000667 x20: ffff8000828765d7 x19: fdf000002ca7a900 x18: ffffffffffffffff x17: 3020303020303020 x16: 3030203030203030 x15: ffff80008ccb2e60 x14: 0000000000000000 x13: ffff80008266b0a8 x12: 0000000000001650 x11: 0000000000000770 x10: ffff80008271b0a8 x9 : ffff80008266b0a8 x8 : 00000000ffffdfff x7 : ffff80008271b0a8 x6 : 80000000ffffe000 x5 : 0000000000017ff4 x4 : 0000000000000000 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000000000000 x0 : f3f0000009542480 Call trace: skb_checksum_help+0x1c0/0x218 net/core/dev.c:3326 ip_do_fragment+0x350/0x584 net/ipv4/ip_output.c:777 ip_fragment.constprop.0+0x48/0xec net/ipv4/ip_output.c:584 ip_finish_output_gso net/ipv4/ip_output.c:286 [inline] __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x164/0x1a0 net/ipv4/ip_output.c:295 ip_finish_output+0x34/0x10c net/ipv4/ip_output.c:323 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip_output+0x68/0x100 net/ipv4/ip_output.c:433 dst_output include/net/dst.h:450 [inline] ip_local_out+0x48/0x5c net/ipv4/ip_output.c:129 iptunnel_xmit+0x138/0x330 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x578/0xa68 net/ipv4/ip_tunnel.c:857 __gre_xmit+0x18c/0x234 net/ipv4/ip_gre.c:483 ipgre_xmit+0x130/0x2d4 net/ipv4/ip_gre.c:687 __netdev_start_xmit include/linux/netdevice.h:4913 [inline] netdev_start_xmit include/linux/netdevice.h:4922 [inline] xmit_one net/core/dev.c:3580 [inline] dev_hard_start_xmit+0x94/0x114 net/core/dev.c:3596 __dev_queue_xmit+0x1b4/0xf48 net/core/dev.c:4423 dev_queue_xmit include/linux/netdevice.h:3105 [inline] packet_xmit+0xc4/0x140 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3145 [inline] packet_sendmsg+0x8a0/0x15e4 net/packet/af_packet.c:3177 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x54/0x60 net/socket.c:745 ____sys_sendmsg+0x274/0x2ac net/socket.c:2597 ___sys_sendmsg+0xac/0x100 net/socket.c:2651 __sys_sendmsg+0x84/0xe0 net/socket.c:2680 __do_sys_sendmsg net/socket.c:2689 [inline] __se_sys_sendmsg net/socket.c:2687 [inline] __arm64_sys_sendmsg+0x24/0x30 net/socket.c:2687 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x48/0x110 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151 el0_svc+0x34/0xec arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598 ---[ end trace 0000000000000000 ]---