netlink: 4 bytes leftover after parsing attributes in process `syz.0.4359'.
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1
WARNING: net/ipv4/route.c:1275 at ip_rt_bug+0x2b/0x150 net/ipv4/route.c:1275, CPU#0: syz.0.4359/16259
Modules linked in:
CPU: 0 UID: 0 PID: 16259 Comm: syz.0.4359 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:ip_rt_bug+0x2b/0x150 net/ipv4/route.c:1275
Code: 0f 1e fa 41 54 55 53 48 89 d3 48 83 ec 08 e8 bc b7 1b f8 66 90 e8 b5 b7 1b f8 ba 02 00 00 00 48 89 de 31 ff e8 76 31 6c ff 90 <0f> 0b 90 48 83 c4 08 31 c0 5b 5d 41 5c c3 cc cc cc cc e8 8e b7 1b
RSP: 0000:ffffc9000d1bf390 EFLAGS: 00010287
RAX: 0000000000000cd1 RBX: ffff888076e14000 RCX: ffffc9000c001000
RDX: 0000000000080000 RSI: ffffffff89587da4 RDI: ffffffff8c1c3800
RBP: ffff888076e14000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888021004d80
R13: ffff888021580f00 R14: 0000000000000000 R15: ffff888076e14058
FS:  0000000000000000(0000) GS:ffff888097177000(0063) knlGS:00000000f5426b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f73d6d50 CR3: 000000007720c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 dst_output include/net/dst.h:470 [inline]
 ip_local_out net/ipv4/ip_output.c:131 [inline]
 ip_send_skb net/ipv4/ip_output.c:1510 [inline]
 ip_push_pending_frames+0x29e/0x300 net/ipv4/ip_output.c:1530
 icmp_push_reply+0x30e/0x450 net/ipv4/icmp.c:408
 __icmp_send+0x11b4/0x2c70 net/ipv4/icmp.c:1000
 icmp_send include/net/icmp.h:43 [inline]
 ip_options_compile+0xb6/0x100 net/ipv4/ip_options.c:473
 ip_rcv_options net/ipv4/ip_input.c:290 [inline]
 ip_rcv_finish_core+0x693/0x2c30 net/ipv4/ip_input.c:430
 ip_rcv_finish net/ipv4/ip_input.c:490 [inline]
 NF_HOOK include/linux/netfilter.h:318 [inline]
 NF_HOOK include/linux/netfilter.h:312 [inline]
 ip_rcv+0x1c0/0x3c0 net/ipv4/ip_input.c:612
 __netif_receive_skb_one_core+0x197/0x1e0 net/core/dev.c:6202
 __netif_receive_skb+0x1f/0x120 net/core/dev.c:6315
 netif_receive_skb_internal net/core/dev.c:6401 [inline]
 netif_receive_skb+0x13b/0x7f0 net/core/dev.c:6460
 tun_rx_batched.isra.0+0x3f6/0x750 drivers/net/tun.c:1511
 tun_get_user+0x1e31/0x3c20 drivers/net/tun.c:1955
 tun_chr_write_iter+0xdc/0x200 drivers/net/tun.c:2001
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1070 fs/read_write.c:688
 ksys_write+0x12a/0x250 fs/read_write.c:740
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 do_int80_emulation+0x141/0x700 arch/x86/entry/syscall_32.c:172
 asm_int80_emulation+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
RIP: 0023:0xf71661ab
Code: 57 56 53 8b 44 24 14 f6 00 08 75 23 8b 44 24 18 8b 5c 24 1c 8b 4c 24 20 8b 54 24 24 8b 74 24 28 8b 7c 24 2c 8b 6c 24 30 cd 80 <5b> 5e 5f 5d c3 5b 5e 5f 5d e9 f7 a1 ff ff 66 90 66 90 66 90 90 53
RSP: 002b:00000000f542644c EFLAGS: 00000246 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 00000000000000c8 RCX: 0000000080000400
RDX: 0000000000000046 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	57                   	push   %rdi
   1:	56                   	push   %rsi
   2:	53                   	push   %rbx
   3:	8b 44 24 14          	mov    0x14(%rsp),%eax
   7:	f6 00 08             	testb  $0x8,(%rax)
   a:	75 23                	jne    0x2f
   c:	8b 44 24 18          	mov    0x18(%rsp),%eax
  10:	8b 5c 24 1c          	mov    0x1c(%rsp),%ebx
  14:	8b 4c 24 20          	mov    0x20(%rsp),%ecx
  18:	8b 54 24 24          	mov    0x24(%rsp),%edx
  1c:	8b 74 24 28          	mov    0x28(%rsp),%esi
  20:	8b 7c 24 2c          	mov    0x2c(%rsp),%edi
  24:	8b 6c 24 30          	mov    0x30(%rsp),%ebp
  28:	cd 80                	int    $0x80
* 2a:	5b                   	pop    %rbx <-- trapping instruction
  2b:	5e                   	pop    %rsi
  2c:	5f                   	pop    %rdi
  2d:	5d                   	pop    %rbp
  2e:	c3                   	ret
  2f:	5b                   	pop    %rbx
  30:	5e                   	pop    %rsi
  31:	5f                   	pop    %rdi
  32:	5d                   	pop    %rbp
  33:	e9 f7 a1 ff ff       	jmp    0xffffa22f
  38:	66 90                	xchg   %ax,%ax
  3a:	66 90                	xchg   %ax,%ax
  3c:	66 90                	xchg   %ax,%ax
  3e:	90                   	nop
  3f:	53                   	push   %rbx