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[lwip-devel] [patch #5957] Safe-thread problem inside netconn_recv

From: Frédéric Bernon
Subject: [lwip-devel] [patch #5957] Safe-thread problem inside netconn_recv
Date: Wed, 23 May 2007 09:04:52 +0000
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; fr; rv: Gecko/20070309 Firefox/


                 Summary: Safe-thread problem inside netconn_recv
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: fbernon
            Submitted on: mercredi 23.05.2007 à 11:04
                Category: None
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: fbernon
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any



In a NETCONN_TCP connection, if an TCP error happens, tcpip_thread will call
err_tcp, which post a NULL message to conn->recvmbox. When the application
side fetch the NULL message, it close the recvmbox and set it to
SYS_MBOX_NULL. It seems safer to only set the conn->err to ERR_CLSD to notify
the application, and to let it close the connection (which will "drain" any
other message in a safer way). In netconn_recv, the modification will be :

if (p == NULL) {
  memp_free(MEMP_NETBUF, buf);
  conn->err = ERR_CLSD;
  return NULL;


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