NDK hang on IP address change with active UDP connections

Hi,

we found a problem with NDK when changing IP address if there's an open UDP socket. In particular the stack hangs in a call to SockCleanPcb(SOCKPROT_UDP…), in SPIpNet() inside netsrv.c

To change IP address we follow this procedure:

/* get the current static IP entry */
CfgGetEntry(0, CFGTAG_IPNET, PHY_MAC_INTERFACE_INDEX, 1, &hCfgIpAddr);

 /* remove the current static IP entry */
CfgRemoveEntry(0, hCfgIpAddr);

 // Add the address to interface 1
CfgAddEntry(0, CFGTAG_IPNET, PHY_MAC_INTERFACE_INDEX, 0, sizeof(CI_IPNET), (UINT8 *) &NA, 0);

We fixed the problem adding the changes below in red to SPIpNet():

// Else if this is a "remove", remove the entry
else if( Op == CFGOP_REMOVE )
  {

        // If no network, return "pass"
        if( !pi->hBind )
            return(0);

        // Remove the network      MOVED AFTER the calls to SockCleanPcb()
        //NtRemoveNetwork( pi->hBind );
        //pi->hBind = 0;

        /* BUG FIX SDSCM00014560
          *  When an IP address is modified we need to close the sockets of all existing
          *  applications. */

        {

            SockCleanPcb (SOCKPROT_TCP, pi->IPAddr);
            SockCleanPcb (SOCKPROT_UDP, pi->IPAddr);
            SockCleanPcb (SOCKPROT_RAW, pi->IPAddr);
        }

        NtRemoveNetwork( pi->hBind );
        pi->hBind = 0;                           

        // Notify NetCtrl
        NC_IPUpdate( pi->IPAddr, Item, 0 );

    }

QUESTION: does it make sense to you? Can you please confirm that this fix is correct?

Best regards
Massimo