netlink: 4 bytes leftover after parsing attributes in process `syz.1.537'. ------------[ cut here ]------------ WARNING: CPU: 2 PID: 8446 at net/ipv4/route.c:1254 ip_rt_bug+0x2b/0x120 net/ipv4/route.c:1254 Modules linked in: CPU: 2 UID: 0 PID: 8446 Comm: syz.1.537 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #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 5c 5a 19 f8 66 90 e8 55 5a 19 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 2e 5a 19 RSP: 0018:ffffc90002b3f2f8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff8880256dbe00 RCX: 1ffffffff2d3ec00 RDX: ffff88801f390000 RSI: ffffffff8974948a RDI: ffffffff8bb06b60 RBP: ffff8880256dbe00 R08: 0000000000000001 R09: fffffbfff2d35fae R10: ffffffff969afd77 R11: 0000000000000004 R12: ffff888067538000 R13: ffff888043e70000 R14: ffff88806a64b000 R15: ffff8880256dbe58 FS: 0000000000000000(0000) GS:ffff88802b600000(0063) knlGS:00000000f5126b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000055fdd1b2da00 CR3: 0000000070eca000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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: 0023:0xf743e579 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:00000000f5126520 EFLAGS: 00000293 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 00000000000000c8 RCX: 0000000020000100 RDX: 00000000000000be RSI: 00000000f742dff4 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