skb frag:     00000090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 05 00
skb frag:     000000a0: 20 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00
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: 5056 at net/core/dev.c:3297 skb_checksum_help+0x525/0x730 net/core/dev.c:3297
Modules linked in:
CPU: 0 PID: 5056 Comm: syz-executor104 Not tainted 6.6.0-rc5-syzkaller-00227-gf6c7b4224356 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:skb_checksum_help+0x525/0x730 net/core/dev.c:3297
Code: 48 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 f9 01 00 00 44 89 e2 2b 53 74 44 89 ee 48 c7 c7 60 1c a3 8b e8 2b a6 1a f9 <0f> 0b e9 46 ff ff ff e8 bf 7d 54 f9 44 0f b6 25 e4 25 85 06 31 ff
RSP: 0018:ffffc90003cef098 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff888013a95a00 RCX: 0000000000000000
RDX: ffff8880265d9dc0 RSI: ffffffff814df0c6 RDI: 0000000000000001
RBP: ffff888013a95a74 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000002969
R13: 0000000000000529 R14: ffff888013a95a70 R15: 00000000000005d1
FS:  0000555555b36380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000d000 CR3: 000000001ce56000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ip_do_fragment+0xa1b/0x18b0 net/ipv4/ip_output.c:775
 ip_fragment.constprop.0+0x161/0x230 net/ipv4/ip_output.c:582
 ip_finish_output_gso net/ipv4/ip_output.c:284 [inline]
 __ip_finish_output net/ipv4/ip_output.c:306 [inline]
 __ip_finish_output+0x49a/0x640 net/ipv4/ip_output.c:293
 ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:321
 NF_HOOK_COND include/linux/netfilter.h:293 [inline]
 ip_mc_output+0x1dd/0x6a0 net/ipv4/ip_output.c:418
 dst_output include/net/dst.h:458 [inline]
 ip_local_out+0xaf/0x190 net/ipv4/ip_output.c:127
 iptunnel_xmit+0x61a/0x9e0 net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x1e4f/0x3370 net/ipv4/ip_tunnel.c:831
 ipgre_xmit+0x63c/0x910 net/ipv4/ip_gre.c:662
 __netdev_start_xmit include/linux/netdevice.h:4889 [inline]
 netdev_start_xmit include/linux/netdevice.h:4903 [inline]
 xmit_one net/core/dev.c:3548 [inline]
 dev_hard_start_xmit+0x13d/0x6c0 net/core/dev.c:3564
 __dev_queue_xmit+0x9b4/0x3d60 net/core/dev.c:4344
 dev_queue_xmit include/linux/netdevice.h:3082 [inline]
 packet_xmit+0x257/0x380 net/packet/af_packet.c:276
 packet_snd net/packet/af_packet.c:3087 [inline]
 packet_sendmsg+0x24d9/0x5580 net/packet/af_packet.c:3119
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xd5/0x180 net/socket.c:745
 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2558
 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2612
 __sys_sendmsg+0x117/0x1e0 net/socket.c:2641
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f13f4451b69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffce999c28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f13f4451b69
RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000003
RBP: 00000000000f4240 R08: 0000000100000000 R09: 0000000100000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007fffce999c80
R13: 0000000000000001 R14: 00007fffce999c80 R15: 0000000000000003
 </TASK>