netlink: 4 bytes leftover after parsing attributes in process `syz.2.3994'. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 16702 at net/ipv4/route.c:1269 ip_rt_bug+0x2b/0x120 net/ipv4/route.c:1269 Modules linked in: CPU: 0 UID: 0 PID: 16702 Comm: syz.2.3994 Not tainted syzkaller #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:ip_rt_bug+0x2b/0x120 net/ipv4/route.c:1269 Code: 0f 1e fa 41 54 55 53 48 89 d3 48 83 ec 08 e8 0c 52 c6 f7 66 90 e8 05 52 c6 f7 ba 02 00 00 00 48 89 de 31 ff e8 f6 8d 70 ff 90 <0f> 0b 90 48 83 c4 08 31 c0 5b 5d 41 5c c3 cc cc cc cc e8 de 51 c6 RSP: 0018:ffffc9000d64f3b8 EFLAGS: 00010287 RAX: 0000000000000bf5 RBX: ffff8880131ba140 RCX: ffffc90004361000 RDX: 0000000000080000 RSI: ffffffff89f4bbea RDI: ffffffff8220827a RBP: ffff8880131ba140 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff90ab7697 R11: 000000000000001e R12: ffff888050eb0000 R13: ffff8880426d3600 R14: ffff88805ec39a00 R15: ffff8880131ba198 FS: 0000000000000000(0000) GS:ffff8880974c4000(0063) knlGS:00000000f545eb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f73bd9d8 CR3: 0000000062595000 CR4: 0000000000352ef0 Call Trace: dst_output include/net/dst.h:461 [inline] dst_output include/net/dst.h:459 [inline] ip_local_out net/ipv4/ip_output.c:129 [inline] ip_send_skb net/ipv4/ip_output.c:1506 [inline] ip_push_pending_frames+0x416/0x5d0 net/ipv4/ip_output.c:1526 icmp_push_reply+0x308/0x440 net/ipv4/icmp.c:394 __icmp_send+0xcdf/0x1960 net/ipv4/icmp.c:783 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:287 [inline] ip_rcv_finish_core+0x6e1/0x22a0 net/ipv4/ip_input.c:394 ip_rcv_finish net/ipv4/ip_input.c:452 [inline] NF_HOOK include/linux/netfilter.h:318 [inline] NF_HOOK include/linux/netfilter.h:312 [inline] ip_rcv+0x1c0/0x600 net/ipv4/ip_input.c:574 __netif_receive_skb_one_core+0x197/0x1e0 net/core/dev.c:5979 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6092 netif_receive_skb_internal net/core/dev.c:6178 [inline] netif_receive_skb+0x137/0x7b0 net/core/dev.c:6237 tun_rx_batched.isra.0+0x3ee/0x740 drivers/net/tun.c:1509 tun_get_user+0x28e4/0x3ce0 drivers/net/tun.c:1950 tun_chr_write_iter+0xdc/0x210 drivers/net/tun.c:1996 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x7d0/0x11d0 fs/read_write.c:686 ksys_write+0x12a/0x250 fs/read_write.c:738 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0x7c/0x3a0 arch/x86/entry/syscall_32.c:306 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf706e579 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:00000000f545e520 EFLAGS: 00000293 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 00000000000000c8 RCX: 0000000080000400 RDX: 0000000000000056 RSI: 00000000f73d4ff4 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- 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