skb frag: 000000b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 skb frag: 000000c0: 00 00 00 00 00 00 00 00 ------------[ cut here ]------------ offset (1321) >= skb_headlen() (104) WARNING: CPU: 0 PID: 4221 at net/core/dev.c:3305 skb_checksum_help+0x55c/0x64c Modules linked in: CPU: 0 PID: 4221 Comm: syz-executor844 Not tainted 6.1.80-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : skb_checksum_help+0x55c/0x64c lr : skb_checksum_help+0x558/0x64c net/core/dev.c:3304 sp : ffff80001dd76aa0 x29: ffff80001dd76ac0 x28: 1fffe0001aa3db28 x27: dfff800000000000 x26: 0000000000002969 x25: 0000000000000068 x24: 0000000000000529 x23: ffff0000d51ed998 x22: ffff0000d51ed930 x21: ffff0000d51ed8c0 x20: 00000000ffffffea x19: 0000000000002969 x18: ffff80001dd75e20 x17: 0000000000000000 x16: ffff800012145f4c x15: 0000000000000000 x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000000001 x11: 0000000000ff0100 x10: 0000000000000000 x9 : f5e4c15a2a440a00 x8 : f5e4c15a2a440a00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80001dd76398 x4 : ffff800015902a60 x3 : ffff80000aa8b40c x2 : ffff0001b435fcd0 x1 : 0000000000000200 x0 : 0000000000000000 Call trace: skb_checksum_help+0x55c/0x64c ip_do_fragment+0x1bc/0x1b14 net/ipv4/ip_output.c:774 ip_fragment+0x11c/0x308 ip_finish_output_gso net/ipv4/ip_output.c:279 [inline] __ip_finish_output+0x280/0x458 net/ipv4/ip_output.c:301 ip_finish_output+0x40/0x268 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_mc_output+0x56c/0x780 net/ipv4/ip_output.c:415 dst_output include/net/dst.h:444 [inline] ip_local_out+0x120/0x160 net/ipv4/ip_output.c:126 iptunnel_xmit+0x40c/0x8ec net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x19b4/0x28f4 net/ipv4/ip_tunnel.c:813 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x68c/0xa18 net/ipv4/ip_gre.c:664 __netdev_start_xmit include/linux/netdevice.h:4853 [inline] netdev_start_xmit include/linux/netdevice.h:4867 [inline] xmit_one net/core/dev.c:3627 [inline] dev_hard_start_xmit+0x25c/0x9a4 net/core/dev.c:3643 __dev_queue_xmit+0x186c/0x38d8 net/core/dev.c:4293 dev_queue_xmit+0x24/0x34 include/linux/netdevice.h:3021 packet_snd net/packet/af_packet.c:3077 [inline] packet_sendmsg+0x36f0/0x4cd8 net/packet/af_packet.c:3108 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x55c/0x848 net/socket.c:2514 ___sys_sendmsg net/socket.c:2568 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2597 __do_sys_sendmsg net/socket.c:2606 [inline] __se_sys_sendmsg net/socket.c:2604 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2604 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 131973 hardirqs last enabled at (131972): [] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:261 hardirqs last disabled at (131973): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (131490): [] softirq_handle_end kernel/softirq.c:414 [inline] softirqs last enabled at (131490): [] __do_softirq+0xc1c/0xe38 kernel/softirq.c:600 softirqs last disabled at (131552): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]---