netdev - Re: general protection fault in dccp_write

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Date:   Tue, 06 Mar 2018 02:10:01 -0800
From:   syzbot <syzbot+f99ab3887ab65d70f816@...kaller.appspotmail.com>
To:     davem@...emloft.net, dccp@...r.kernel.org, gerrit@....abdn.ac.uk,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: general protection fault in dccp_write_xmit

syzbot has found reproducer for the following crash on upstream commit
094b58e1040a44f991d7ab628035e69c4d6b79c9 (Mon Mar 5 19:57:06 2018 +0000)
Merge tag 'linux-kselftest-4.16-rc5' of  
git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest

So far this crash happened 4 times on net-next, upstream.
C reproducer is attached.
syzkaller reproducer is attached.
Raw console output is attached.
compiler: gcc (GCC) 7.1.1 20170620
.config is attached.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+f99ab3887ab65d70f816@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed.

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
    (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 4830 Comm: syzkaller256346 Not tainted 4.16.0-rc4+ #342
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:ccid_hc_tx_send_packet net/dccp/ccid.h:169 [inline]
RIP: 0010:dccp_write_xmit+0x69/0x1d0 net/dccp/output.c:353
RSP: 0018:ffff8801d90ef708 EFLAGS: 00010246
RAX: ffff8801d85fa400 RBX: ffff8801d1b86040 RCX: ffffffff854d7bd1
RDX: 0000000000000000 RSI: 1ffff1003b0bf593 RDI: ffff8801d1b86040
RBP: ffff8801d90ef738 R08: 1ffff1003b21dea3 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801daf4c0c0
R13: dffffc0000000000 R14: ffffed003a370d03 R15: 0000000000000000
FS:  00007f3d6c238700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002047b000 CR3: 00000001b0f13006 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  dccp_sendmsg+0x95f/0xdc0 net/dccp/proto.c:813
  inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764
  sock_sendmsg_nosec net/socket.c:630 [inline]
  sock_sendmsg+0xca/0x110 net/socket.c:640
  ___sys_sendmsg+0x767/0x8b0 net/socket.c:2046
  __sys_sendmsg+0xe5/0x210 net/socket.c:2080
  SYSC_sendmsg net/socket.c:2091 [inline]
  SyS_sendmsg+0x2d/0x50 net/socket.c:2087
  do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
  entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x446c19
RSP: 002b:00007f3d6c237db8 EFLAGS: 00000293 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000006e29e4 RCX: 0000000000446c19
RDX: 0000000020000000 RSI: 0000000020000140 RDI: 0000000000000006
RBP: 00000000006e29e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007fff4243261f R14: 00007f3d6c2389c0 R15: 0000000000000009
Code: 00 00 48 85 c0 49 89 c4 0f 84 fb 00 00 00 e8 5f 8a 23 fc 41 80 3e 00  
0f 85 5a 01 00 00 4c 8b bb d8 07 00 00 4c 89 fa 48 c1 ea 03 <42> 80 3c 2a  
00 0f 85 34 01 00 00 4d 8b 3f 49 8d bf b0 00 00 00
RIP: ccid_hc_tx_send_packet net/dccp/ccid.h:169 [inline] RSP:  
ffff8801d90ef708
RIP: dccp_write_xmit+0x69/0x1d0 net/dccp/output.c:353 RSP: ffff8801d90ef708
---[ end trace 208b13b56f4da922 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


View attachment "raw.log.txt" of type "text/plain" (10189 bytes)

View attachment "repro.syz.txt" of type "text/plain" (1104 bytes)

View attachment "repro.c.txt" of type "text/plain" (19996 bytes)

View attachment "config.txt" of type "text/plain" (137392 bytes)