[lwip-devel] [bug #47743] Closing listening tcp pcb is not posible without assert

[Jan Breuer]

URL:
  <http://savannah.nongnu.org/bugs/?47743>

                 Summary: Closing listening tcp pcb is not posible without
assert
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: jan_breuer
            Submitted on: Wed 20 Apr 2016 06:07:27 PM GMT
                Category: TCP
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: git head

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Details:

Closing listening tcp pcb is not posible without assert.

tcp_listen_closed could not satisfy pcb->state == LISTEN

In function tcp_close_shutdown
there is section 
case LISTEN:
and there is sequence 
tcp_pcb_remove
tcp_listen_closed

problem is, that tcp_pcb_remove sets state to CLOSE
and after that tcp_listen_closed verifies, if state is still LISTEN and this
can't be true.

I don't know internals of tcp so I can't fix this correctly.




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