[lwip-devel] [bug #21656] recvmbox problem in netconn API (netconn_recv and others)

[Simon Goldschmidt]

URL:
  <http://savannah.nongnu.org/bugs/?21656>

                 Summary: recvmbox problem in netconn API (netconn_recv and
others)
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: goldsimon
            Submitted on: Dienstag 27.11.2007 um 21:27
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 

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Details:

The recvmbox of a netconn is allocated in:

- netconn_bind (only for UDP/RAW)
- netconn_connect
- netconn_recv

So I think there is a problem here: When creating a UDP or RAW netconn that
doesn't bind or connect but implicitly sends using sendto and gets an answer
for that, the recvmbox is effectively only allocated in netconn_recv. If
netconn_recv is called too late, recvmbox is NULL in api_msg.c:recv_udp() and
the received data is simply thrown away.

Therefore, I would suggest always allocating a recvmbox (in
netconn_new_with....) and freeing this mbox when allocating an acceptmbox for
TCP listen netconns in api_msg.c:do_listen().




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