syzbot

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: 1 PID: 5082 at net/core/dev.c:3278 skb_checksum_help+0x5f9/0x730 net/core/dev.c:3277
Modules linked in:
CPU: 1 PID: 5082 Comm: syz-executor197 Not tainted 6.9.0-rc7-syzkaller-00023-g6d7ddd805123 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:skb_checksum_help+0x5f9/0x730 net/core/dev.c:3277
Code: 48 8b 4c 24 10 0f b6 04 01 84 c0 0f 85 dd 00 00 00 48 8b 44 24 08 2b 18 48 c7 c7 40 83 c0 8c 44 89 f6 89 da e8 78 e5 0e f8 90 <0f> 0b 90 90 bb ea ff ff ff e9 65 fd ff ff e8 34 73 4c f8 c6 05 db
RSP: 0018:ffffc9000355ee48 EFLAGS: 00010246
RAX: 4b05a7a9c2c92600 RBX: 0000000000000068 RCX: ffff88802c5f0000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000002969 R08: ffffffff81587c52 R09: 1ffff110172a519a
R10: dffffc0000000000 R11: ffffed10172a519b R12: 1ffff110055fe79e
R13: dffffc0000000000 R14: 0000000000000529 R15: ffff88802aff3c80
FS:  00005555723eb380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000d000 CR3: 0000000078680000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ip_do_fragment+0x21b/0x1b60 net/ipv4/ip_output.c:777
 ip_finish_output_gso net/ipv4/ip_output.c:286 [inline]
 __ip_finish_output+0x290/0x400 net/ipv4/ip_output.c:308
 iptunnel_xmit+0x540/0x9b0 net/ipv4/ip_tunnel_core.c:82
 ip_tunnel_xmit+0x20ef/0x2940 net/ipv4/ip_tunnel.c:857
 __gre_xmit net/ipv4/ip_gre.c:474 [inline]
 ipgre_xmit+0x854/0xc30 net/ipv4/ip_gre.c:670
 __netdev_start_xmit include/linux/netdevice.h:4903 [inline]
 netdev_start_xmit include/linux/netdevice.h:4917 [inline]
 xmit_one net/core/dev.c:3531 [inline]
 dev_hard_start_xmit+0x27a/0x7e0 net/core/dev.c:3547
 __dev_queue_xmit+0x1ad1/0x3ca0 net/core/dev.c:4341
 packet_snd net/packet/af_packet.c:3081 [inline]
 packet_sendmsg+0x46a9/0x6130 net/packet/af_packet.c:3113
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc5cff484d9
Code: 48 83 c4 28 c3 e8 d7 19 00 00 0f 1f 80 00 00 00 00 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:00007ffe3eb8f778 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fc5cff95390 RCX: 00007fc5cff484d9
RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000555500000000 R09: 0000555500000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007ffe3eb8f7c0
R13: 00007ffe3eb8f790 R14: 0000000000000001 R15: 00007ffe3eb8f7c0
 </TASK>