skb linear: 000000f0: 62 77 73 72 0f e7 89 81 23 69 24 a5 87 3c 97 f8 skb linear: 00000100: 71 56 8f 22 fe 34 cf ff fb d6 c3 6e 0c 00 00 00 skb linear: 00000110: 00 00 00 00 00 00 00 00 00 00 00 c0 63 ad 88 9f skb linear: 00000120: 44 8a 17 df 3d 91 96 a3 77 4d f1 f6 cc 8d c6 d5 ------------[ cut here ]------------ offset (10633) >= skb_headlen() (10625) WARNING: CPU: 0 PID: 6475 at net/core/dev.c:3325 skb_checksum_help+0x554/0x644 Modules linked in: CPU: 0 PID: 6475 Comm: syz.1.24 Not tainted 6.10.0-rc7-syzkaller-gc912bf709078 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : skb_checksum_help+0x554/0x644 lr : skb_checksum_help+0x550/0x644 net/core/dev.c:3324 sp : ffff8000a97669e0 x29: ffff8000a9766a00 x28: 1fffe00019c91178 x27: dfff800000000000 x26: 0000000000002981 x25: 0000000000002981 x24: 0000000000002989 x23: ffff0000ce488c18 x22: ffff0000ce488bb0 x21: ffff0000ce488b40 x20: 00000000ffffffea x19: 0000000000002981 x18: 0000000000000008 x17: 0000000000000000 x16: ffff800082f8f174 x15: 0000000000000001 x14: 1ffff000152ecc8c x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000040000 x10: 00000000000111a3 x9 : da97a288baadc900 x8 : da97a288baadc900 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff8000a9766138 x4 : ffff80008f1e5220 x3 : ffff800082f1a584 x2 : 0000000000000001 x1 : 0000000000000200 x0 : 0000000000000000 Call trace: skb_checksum_help+0x554/0x644 ip_do_fragment+0x1cc/0x1b38 net/ipv4/ip_output.c:777 ip_fragment+0x11c/0x304 ip_finish_output_gso net/ipv4/ip_output.c:286 [inline] __ip_finish_output+0x280/0x458 net/ipv4/ip_output.c:308 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:450 [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+0x16d4/0x261c net/ipv4/ip_tunnel.c:857 __gre_xmit net/ipv4/ip_gre.c:483 [inline] ipgre_xmit+0x774/0xb34 net/ipv4/ip_gre.c:687 __netdev_start_xmit include/linux/netdevice.h:4882 [inline] netdev_start_xmit include/linux/netdevice.h:4896 [inline] xmit_one net/core/dev.c:3578 [inline] dev_hard_start_xmit+0x260/0x904 net/core/dev.c:3594 __dev_queue_xmit+0x1670/0x33f4 net/core/dev.c:4393 dev_queue_xmit include/linux/netdevice.h:3095 [inline] packet_xmit+0x6c/0x314 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3080 [inline] packet_sendmsg+0x3788/0x4c9c net/packet/af_packet.c:3112 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x4d8/0x77c net/socket.c:2585 ___sys_sendmsg net/socket.c:2639 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2668 __do_sys_sendmsg net/socket.c:2677 [inline] __se_sys_sendmsg net/socket.c:2675 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2675 __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:131 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150 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: 7803 hardirqs last enabled at (7802): [] __up_console_sem kernel/printk/printk.c:341 [inline] hardirqs last enabled at (7802): [] __console_unlock kernel/printk/printk.c:2731 [inline] hardirqs last enabled at (7802): [] console_unlock+0x18c/0x3d4 kernel/printk/printk.c:3050 hardirqs last disabled at (7803): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:470 softirqs last enabled at (7370): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (7456): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]---