main: fix Array out of bounds access

[jobo-zt]

No description provided.

[jobo-zt]

maby this right, in multi thread.

if (!fhs || !fhs->fh)
	continue;
++cfds;

[sreimers]

I think this is hiding the underlying problem, there should never more active file descriptors than maxfds. I have to investigate, we should first add a test case to reproduce the problem. I can have a look next week.

[jobo-zt]

udp_thread_detach needs to end in the thread where fd_sten is located, otherwise (! Fhs | |! Fhs ->fh) holds and continues to loop.

Can the above description provide some clues for testing work. thanks

[alfredh]

I dont think this change is needed.

It would be nice to have a testcase first to demonstrate the problem...

[jobo-zt]

In the multi thread of restund, it is not in the same thread, so there will be problems when ending the UDP connection.

1. The purpose of this change is to increase boundary security.
2. As a result, some efficiency will be lost in the main loop.