[BUG]: Server will crash when client send RTMP poc messages

[50u1w4y]

现象描述

After cmake(Debug version) and run with ./MediaServer(maybe add sudo to support port below 1024), a client can send RTMP requests to make the server crash.

如何复现?

1. git clone from github with git clone --depth 1 https://github.com/ZLMediaKit/ZLMediaKit.git and git submodule update --init and cmake it.
2. just run server using command [sudo] ./MediaServer with default config.ini
3. using ffmpeg to push flow or not (say crash in both situation)
4. run sender.py with poc

相关日志或截图

展开查看详细日志

when not push flow:

when push flow:

配置

展开查看详细配置

default config(after cmake and changed nothing)

各种环境信息

• git commit hash: d0f0c69
• 操作系统及版本: Ubuntu 20.04
• 硬件信息: Intel
• 其他需要补充的信息

[xia-chu]

Can you run gdb to debug MediaServer ?

[xia-chu]

Is this right ?

$ python ./sender.py 127.0.0.1 1935 ./poc
sendbuf len is 3664
going to send 1537 bytes data
Traceback (most recent call last):
  File "./sender.py", line 40, in <module>
    while len(n) > 0:
NameError: name 'n' is not defined

[50u1w4y]

Of course not right. It seems that the first time receive timeout.

Yes, in gdb the server will receive something like Thread 4 "event poller 0" received signal SIGSEGV, Segmentation fault.

[xia-chu]

You can past the snap of bt in gdb.

[50u1w4y]

can't you reproduce that?

You can try run again, this error is because the receive timeout, maybe the network stucks.

The client is just sent the handshake packet(C0+C1), the server should return S0+S1+S2 now, but receive timeout.

[xia-chu]

Yes, i reproduce this; and fix the bug.

[xia-chu]

Thanks for your feedback!

[xia-chu]

fixed