netlink: 4 bytes leftover after parsing attributes in process `syz.3.1188'.
------------[ cut here ]------------
WARNING: CPU: 3 PID: 11609 at net/ipv4/route.c:1254 ip_rt_bug+0x2b/0x120 net/ipv4/route.c:1254
Modules linked in:
CPU: 3 UID: 0 PID: 11609 Comm: syz.3.1188 Not tainted 6.12.0-syzkaller-10681-g65ae975e97d5 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:ip_rt_bug+0x2b/0x120 net/ipv4/route.c:1254
Code: 0f 1e fa 41 54 55 53 48 89 d3 48 83 ec 08 e8 ec 00 0f f8 66 90 e8 e5 00 0f f8 ba 02 00 00 00 48 89 de 31 ff e8 16 0e 75 ff 90 <0f> 0b 90 48 83 c4 08 31 c0 5b 5d 41 5c c3 cc cc cc cc e8 be 00 0f
RSP: 0018:ffffc900046df2f8 EFLAGS: 00010287
RAX: 0000000000000bf0 RBX: ffff8880251eaa00 RCX: ffffc9000d193000
RDX: 0000000000080000 RSI: ffffffff897f003a RDI: ffffffff81f0ca4a
RBP: ffff8880251eaa00 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff903e40d7 R11: 00000000000a401e R12: ffff88804c608000
R13: ffff88801f6a06c0 R14: ffff88804b796000 R15: ffff8880251eaa58
FS:  0000000000000000(0000) GS:ffff88802b700000(0063) knlGS:00000000f5086b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7193c60 CR3: 00000000211b8000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dst_output include/net/dst.h:450 [inline]
 dst_output include/net/dst.h:448 [inline]
 ip_local_out net/ipv4/ip_output.c:130 [inline]
 ip_send_skb net/ipv4/ip_output.c:1505 [inline]
 ip_push_pending_frames+0x3ad/0x5b0 net/ipv4/ip_output.c:1525
 icmp_push_reply+0x310/0x450 net/ipv4/icmp.c:393
 __icmp_send+0xac1/0x1750 net/ipv4/icmp.c:779
 icmp_send include/net/icmp.h:43 [inline]
 __udp4_lib_rcv+0x1726/0x34e0 net/ipv4/udp.c:2650
 ip_protocol_deliver_rcu+0x2ff/0x4c0 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x316/0x570 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:460 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:447 [inline]
 NF_HOOK include/linux/netfilter.h:314 [inline]
 NF_HOOK include/linux/netfilter.h:308 [inline]
 ip_rcv+0x2c3/0x5d0 net/ipv4/ip_input.c:567
 __netif_receive_skb_one_core+0x199/0x1e0 net/core/dev.c:5672
 __netif_receive_skb+0x1d/0x160 net/core/dev.c:5785
 netif_receive_skb_internal net/core/dev.c:5871 [inline]
 netif_receive_skb+0x13f/0x7b0 net/core/dev.c:5930
 tun_rx_batched.isra.0+0x3eb/0x730 drivers/net/tun.c:1574
 tun_get_user+0x2a01/0x3e30 drivers/net/tun.c:2007
 tun_chr_write_iter+0xdc/0x210 drivers/net/tun.c:2053
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0x5ae/0x1150 fs/read_write.c:679
 ksys_write+0x12b/0x250 fs/read_write.c:731
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f00579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f5086540 EFLAGS: 00000293 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 00000000000000c8 RCX: 0000000020000100
RDX: 00000000000000be RSI: 00000000f7390ff4 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	10 06                	adc    %al,(%rsi)
   2:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
   6:	10 07                	adc    %al,(%rdi)
   8:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
   c:	10 08                	adc    %cl,(%rax)
   e:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1e:	00 51 52             	add    %dl,0x52(%rcx)
  21:	55                   	push   %rbp
  22:	89 e5                	mov    %esp,%ebp
  24:	0f 34                	sysenter
  26:	cd 80                	int    $0x80
* 28:	5d                   	pop    %rbp <-- trapping instruction
  29:	5a                   	pop    %rdx
  2a:	59                   	pop    %rcx
  2b:	c3                   	ret
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	90                   	nop
  2f:	90                   	nop
  30:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  37:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi