netdev - general protection fault in dccp_write

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Date:   Sun, 28 Jan 2018 22:56:01 -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: general protection fault in dccp_write_xmit

Hello,

syzbot hit the following crash on net-next commit
751c45bd828f935ac6330b933ff10bf55277c84c (Sun Jan 28 13:54:38 2018 +0000)
net/rocker: Remove unreachable return instruction

So far this crash happened 2 times on net-next.
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. See footer for  
details.
If you forward the report, please keep this part and the footer.

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: 0 PID: 4776 Comm: syz-executor7 Not tainted 4.15.0-rc9+ #213
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:ffff8801c0caf858 EFLAGS: 00010246
RAX: ffff8801c0c8e680 RBX: ffff8801c42bac00 RCX: ffffffff851810e1
RDX: 0000000000000000 RSI: 1ffff10038191de3 RDI: ffff8801c42bac00
RBP: ffff8801c0caf888 R08: 1ffff10038195ecd R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801ce724a80
R13: dffffc0000000000 R14: ffffed003885767b R15: 0000000000000000
FS:  00007f8e97ec4700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020fc0000 CR3: 00000001c1667004 CR4: 00000000001606f0
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
  entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x453299
RSP: 002b:00007f8e97ec3c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299
RDX: 0000000000000000 RSI: 00000000205dffc8 RDI: 0000000000000006
RBP: 00000000000003d6 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4cb0
R13: 00000000ffffffff R14: 00007f8e97ec46d4 R15: 0000000000000000
Code: 00 00 48 85 c0 49 89 c4 0f 84 fb 00 00 00 e8 ff 22 58 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:  
ffff8801c0caf858
RIP: dccp_write_xmit+0x69/0x1d0 net/dccp/output.c:353 RSP: ffff8801c0caf858
---[ end trace 44d568fb1dfae12b ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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View attachment "raw.log.txt" of type "text/plain" (8495 bytes)

View attachment "repro.syz.txt" of type "text/plain" (1724 bytes)

View attachment "config.txt" of type "text/plain" (136464 bytes)