skb linear:   000000e0: 2e 87 50 68 ea 33 cb 7e 1f c2 2b 31 3d 12 2f c9
skb linear:   000000f0: 1f 58
------------[ cut here ]------------
offset (1023) >= skb_headlen() (242)
WARNING: CPU: 0 PID: 5320 at net/core/dev.c:3519 skb_checksum_help+0x6e2/0x810 net/core/dev.c:3518
Modules linked in:
CPU: 0 UID: 0 PID: 5320 Comm: syz-executor916 Not tainted 6.15.0-rc1-syzkaller-00301-g3bde70a2c827 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:skb_checksum_help+0x6e2/0x810 net/core/dev.c:3518
Code: 48 8b 4c 24 18 0f b6 04 01 84 c0 0f 85 e1 00 00 00 48 8b 44 24 08 2b 18 48 c7 c7 40 5e 50 8d 44 89 fe 89 da e8 2f 12 97 f7 90 <0f> 0b 90 90 bb ea ff ff ff e9 90 fc ff ff e8 9b f0 d7 f7 c6 05 d1
RSP: 0018:ffffc9000d45eee8 EFLAGS: 00010246
RAX: 76efe6db7c66d000 RBX: 00000000000000f2 RCX: ffff888000208000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000000f2 R08: ffffffff81827952 R09: fffffbfff1d7a970
R10: dffffc0000000000 R11: fffffbfff1d7a970 R12: 000000000000043f
R13: ffff888042f2d3c0 R14: 1ffff110085e5a88 R15: 00000000000003ff
FS:  000055559255b380(0000) GS:ffff88808c594000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000368a CR3: 00000000420c0000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 skb_csum_hwoffload_help+0x5c8/0xa70 net/core/dev.c:3841
 validate_xmit_skb+0xa41/0x1150 net/core/dev.c:3887
 __dev_queue_xmit+0x17be/0x3f60 net/core/dev.c:4619
 dev_queue_xmit include/linux/netdevice.h:3350 [inline]
 phonet_rcv+0xa65/0x1000 net/phonet/af_phonet.c:439
 __netif_receive_skb_one_core net/core/dev.c:5885 [inline]
 __netif_receive_skb+0x2ea/0x670 net/core/dev.c:5998
 netif_receive_skb_internal net/core/dev.c:6084 [inline]
 netif_receive_skb+0x1ea/0x890 net/core/dev.c:6143
 tun_rx_batched+0x1a4/0x8d0 drivers/net/tun.c:1485
 tun_get_user+0x2fec/0x47c0 drivers/net/tun.c:1938
 tun_chr_write_iter+0x10d/0x1f0 drivers/net/tun.c:1984
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x70f/0xd10 fs/read_write.c:684
 ksys_write+0x19d/0x2d0 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efe62f519d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 31 1a 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:00007fff03bb5968 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007efe62f519d9
RDX: 0000000000001012 RSI: 0000200000002680 RDI: 000000000000000d
RBP: 0000200000000080 R08: 00007fff03bb5990 R09: 00007fff03bb5990
R10: 00007fff03bb5990 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000200000000004 R15: 00007fff03bb59a0
 </TASK>