syzbot

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 (29721) >= skb_headlen() (10613)
WARNING: CPU: 1 PID: 4223 at net/core/dev.c:3305 skb_checksum_help+0x55c/0x64c
Modules linked in:
CPU: 1 PID: 4223 Comm: syz-executor322 Not tainted 6.1.87-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
pstate: 60401005 (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 : ffff80001df06aa0
x29: ffff80001df06ac0 x28: 1fffe00018832c38 x27: dfff800000000000
x26: 0000000000002975 x25: 0000000000002975 x24: 0000000000007419
x23: ffff0000c4196218 x22: ffff0000c41961b0 x21: ffff0000c4196140
x20: 00000000ffffffea x19: 0000000000002975 x18: ffff80001df05e20
x17: 0000000000000000 x16: ffff80001215c9dc x15: 0000000000000000
x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000000001
x11: 0000000000ff0100 x10: 0000000000000000 x9 : c23e06ae72d12b00
x8 : c23e06ae72d12b00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff80001df06398 x4 : ffff800015932b00 x3 : ffff80000aa9158c
x2 : ffff0001b4378cd0 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+0x19a0/0x28bc net/ipv4/ip_tunnel.c:840
 __gre_xmit net/ipv4/ip_gre.c:474 [inline]
 ipgre_xmit+0x70c/0xab0 net/ipv4/ip_gre.c:669
 __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: 130947
hardirqs last  enabled at (130946): [<ffff800008343d08>] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:261
hardirqs last disabled at (130947): [<ffff800012158694>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (130524): [<ffff8000103c6b80>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (130524): [<ffff8000103c6b80>] release_sock+0x178/0x1cc net/core/sock.c:3510
softirqs last disabled at (130638): [<ffff8000104499bc>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---