netdev - BUG: unable to handle kernel NULL pointer dereference in strlen

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Date:   Sat, 23 Dec 2017 04:59:01 -0800
From:   syzbot 
        <bot+096d544bb71ddbfd4666577e93f4b25aed8e6255@...kaller.appspotmail.com>
To:     daniel@...earbox.net, davem@...emloft.net, dsahern@...il.com,
        fw@...len.de, jakub.kicinski@...ronome.com, jbenc@...hat.com,
        linux-kernel@...r.kernel.org, lucien.xin@...il.com,
        mschiffer@...verse-factory.net, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, vyasevich@...il.com
Subject: BUG: unable to handle kernel NULL pointer dereference in strlen

Hello,

syzkaller hit the following crash on  
6084b576dca2e898f5c101baef151f7bfdbb606d
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.

Unfortunately, I don't have any reproducer for this bug yet.


netlink: 1 bytes leftover after parsing attributes in process  
`syz-executor5'.
BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
IP: strlen+0x0/0x30 lib/string.c:255
PGD 1fa2a3067 P4D 1fa2a3067 PUD 2156db067 PMD 0
Oops: 0000 [#1] SMP
Dumping ftrace buffer:
    (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 25068 Comm: syz-executor5 Not tainted 4.15.0-rc3-next-20171214+  
#67
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:strlen+0x0/0x30 lib/string.c:255
RSP: 0018:ffffc90000f63728 EFLAGS: 00010202
RAX: 0000000000010000 RBX: ffff880215647500 RCX: ffffffff820f1e86
RDX: 0000000000003b6e RSI: ffffc90004536000 RDI: 0000000000000010
RBP: ffffc90000f637a8 R08: 0000000000000000 R09: ffff88020d91707d
R10: ffffc90000f636b8 R11: 0000000000000002 R12: ffff8801fba87000
R13: 0000000000000010 R14: 0000000000000000 R15: ffff88020d917000
FS:  00007f7abdffd700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000010 CR3: 000000020f0fe005 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
  rtnl_dump_ifinfo+0x37c/0x570 net/core/rtnetlink.c:1834
  netlink_dump+0x14e/0x360 net/netlink/af_netlink.c:2222
  __netlink_dump_start+0x1bb/0x210 net/netlink/af_netlink.c:2319
  netlink_dump_start include/linux/netlink.h:214 [inline]
  rtnetlink_rcv_msg+0x44f/0x5d0 net/core/rtnetlink.c:4485
  netlink_rcv_skb+0x92/0x160 net/netlink/af_netlink.c:2441
  rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4540
  netlink_unicast_kernel net/netlink/af_netlink.c:1308 [inline]
  netlink_unicast+0x1d4/0x290 net/netlink/af_netlink.c:1334
  netlink_sendmsg+0x345/0x470 net/netlink/af_netlink.c:1897
  sock_sendmsg_nosec net/socket.c:636 [inline]
  sock_sendmsg+0x51/0x70 net/socket.c:646
  sock_write_iter+0xa4/0x100 net/socket.c:915
  call_write_iter include/linux/fs.h:1776 [inline]
  do_iter_readv_writev+0x17d/0x1f0 fs/read_write.c:653
  do_iter_write+0xbc/0x210 fs/read_write.c:932
  vfs_writev+0xa1/0x120 fs/read_write.c:977
  do_writev+0x5e/0x100 fs/read_write.c:1012
  SYSC_writev fs/read_write.c:1085 [inline]
  SyS_writev+0x27/0x30 fs/read_write.c:1082
  entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a09
RSP: 002b:00007f7abdffcc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452a09
RDX: 0000000000000001 RSI: 00000000206f6000 RDI: 0000000000000013
RBP: 000000000000056f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f5308
R13: 00000000ffffffff R14: 00007f7abdffd6d4 R15: 0000000000000000
Code: 89 f8 48 89 fa 48 89 e5 74 09 48 83 c2 01 80 3a 00 75 f7 48 83 c6 01  
0f b6 4e ff 48 83 c2 01 84 c9 88 4a ff 75 ed 5d c3 0f 1f 00 <80> 3f 00 55  
48 89 e5 74 14 48 89 f8 48 83 c7 01 80 3f 00 75 f7
RIP: strlen+0x0/0x30 lib/string.c:255 RSP: ffffc90000f63728
CR2: 0000000000000010
---[ end trace 72499b0f3e5056d0 ]---


---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@...glegroups.com.
Please credit me with: Reported-by: syzbot <syzkaller@...glegroups.com>

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