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

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Message-ID: <001a113a78822c26ed0560b0e4ee@google.com>
Date:   Tue, 19 Dec 2017 04:49:02 -0800
From:   syzbot 
        <bot+259a072a0d23f377c591a43e4368fcf34b1cc7bc@...kaller.appspotmail.com>
To:     davem@...emloft.net, jhs@...atatu.com, jiri@...nulli.us,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, xiyou.wangcong@...il.com
Subject: BUG: unable to handle kernel NULL pointer dereference in tc_fill_qdisc

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.


BUG: unable to handle kernel NULL pointer dereference at           (null)
IP: qdisc_dev include/net/sch_generic.h:379 [inline]
IP: tc_fill_qdisc+0xc8/0x4b0 net/sched/sch_api.c:792
PGD 1dc5d4067 P4D 1dc5d4067 PUD 1db5fa067 PMD 0
Oops: 0000 [#1] SMP
Dumping ftrace buffer:
    (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 7609 Comm: syz-executor4 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:qdisc_dev include/net/sch_generic.h:379 [inline]
RIP: 0010:tc_fill_qdisc+0xc8/0x4b0 net/sched/sch_api.c:792
RSP: 0018:ffffc90000ea38c8 EFLAGS: 00010212
RAX: 0000000000000000 RBX: ffff880216ac3c00 RCX: ffffffff8212563c
RDX: 0000000000000a02 RSI: ffffc90004f53000 RDI: ffff8801dc6a20b0
RBP: ffffc90000ea3970 R08: 0000000000000014 R09: ffff8801dc6a20b0
R10: ffffc90000ea37d8 R11: 0000000000000002 R12: ffff880214161b00
R13: ffff8801dc6a208c R14: 0000000000000000 R15: 0000000000000002
FS:  00007f6db5bc5700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001dc75a000 CR4: 00000000001426f0
DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
  tc_dump_qdisc_root+0x1f1/0x220 net/sched/sch_api.c:1474
  tc_dump_qdisc+0x1a1/0x280 net/sched/sch_api.c:1540
  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
  ___sys_sendmsg+0x35e/0x3b0 net/socket.c:2026
  __sys_sendmsg+0x50/0x90 net/socket.c:2060
  SYSC_sendmsg net/socket.c:2071 [inline]
  SyS_sendmsg+0x2d/0x50 net/socket.c:2067
  entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a39
RSP: 002b:00007f6db5bc4c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452a39
RDX: 0000000000000000 RSI: 000000002061efc8 RDI: 000000000000001c
RBP: 0000000000000343 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f2ee8
R13: 00000000ffffffff R14: 00007f6db5bc56d4 R15: 0000000000000000
Code: 41 b8 14 00 00 00 4c 89 e7 e8 05 17 01 00 48 85 c0 49 89 c5 0f 84 cb  
02 00 00 e8 04 4d 19 ff 41 c7 45 10 00 00 00 00 48 8b 43 40 <48> 8b 00 8b  
80 08 01 00 00 45 89 75 1c 41 89 45 14 8b 43 38 41
RIP: qdisc_dev include/net/sch_generic.h:379 [inline] RSP: ffffc90000ea38c8
RIP: tc_fill_qdisc+0xc8/0x4b0 net/sched/sch_api.c:792 RSP: ffffc90000ea38c8
CR2: 0000000000000000
---[ end trace dffd1876816a33a6 ]---


---
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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