[lwip-devel] [bug #50418] LWIP_EVENT_API: fix invalid calbacks for SYN_RCVD pcb

[Simon Goldschmidt]

URL:
  <http://savannah.nongnu.org/bugs/?50418>

                 Summary: LWIP_EVENT_API: fix invalid calbacks for SYN_RCVD
pcb
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: goldsimon
            Submitted on: Tue 28 Feb 2017 11:12:14 AM UTC
                Category: TCP
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: In Progress
                 Privacy: Public
             Assigned to: goldsimon
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: git head

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Details:

See bug #50276, comment #2:
When a pcb is in SYN_RCVD, poll and err events can be executed for this pcb.
However, the application has not seen this pcb yet (just created by listen
input).
For LWIP_CALLBACK_API, all callbacks except 'accept' are still NULL.
However, the callback_arg is != NULL and typically set to the listener. Now if
the listener has been closed already, the callback_arg points to deallocated
memory.

Since this is not a problem for LWIP_CALLBACK_API, the fix prevents calling
poll and err events for pcbs in SYN_RCVD.




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