[lwip-devel] [bug #16830] err_tcp() posts to connection mailbox when no pend on the mailbox is active

[anonymous]

URL:
  <http://savannah.nongnu.org/bugs/?func=detailitem&item_id=16830>

                 Summary: err_tcp() posts to connection mailbox when no pend
on the mailbox is active
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: None
            Submitted on: Monday 06/12/2006 at 12:33 UTC
                Category: TCP
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open

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Details:

When a TCP error occurs and err_tcp() is called, the function posts a null
message to the connection's mailbox.  Since the mailbox is used for
synchronization of connection messages to the TCP thread, posting to it is
only valid when a connection function is pending on the result.  It appears
that this only occurs when the connection is attempting to connect via a call
to netconn_connect(). In all other instances, the connection's mailbox will
receive a message from the TCP thread.

Posting an extra message in err_tcp() causes the next netconn_xxx() API call
to immediately proceed when it performs its sys_mbox_fetch(). This results in
a it prematurely proceeding and freeing the message object it submitted.






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File Attachments:


-------------------------------------------------------
Date: Monday 06/12/2006 at 12:33 UTC  Name: err_tcp_patch.txt  Size: 1.24KB  
By: None
Simple-minded patch
<http://savannah.nongnu.org/bugs/download.php?file_id=10178>

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