--- mysql-5.0.75.orig/sql/net_serv.cc	2008-12-18 09:20:14.000000000 -0800
+++ mysql-5.0.75.bug33384/sql/net_serv.cc	2009-01-28 18:25:45.000000000 -0800
@@ -291,7 +291,7 @@
   DBUG_ENTER("net_clear");
 
 #if !defined(EMBEDDED_LIBRARY)
-  while((ready= net_data_is_ready(net->vio->sd)) > 0)
+  while(net->vio && (ready= net_data_is_ready(net->vio->sd)) > 0)
   {
     /* The socket is ready */
     if ((count= vio_read(net->vio, (char*) (net->buff),
--- mysql-5.0.75.orig/libmysql/libmysql.c	2008-12-18 09:19:37.000000000 -0800
+++ mysql-5.0.75.bug33384/libmysql/libmysql.c	2009-01-28 18:38:29.000000000 -0800
@@ -2480,11 +2480,18 @@
     uint null_count;
     my_bool    result;
 
+    if (net->vio == NULL)
+    {
+      set_stmt_error(stmt, CR_SERVER_GONE_ERROR, unknown_sqlstate);
+      DBUG_RETURN(1);
+    }
+
     if (!stmt->bind_param_done)
     {
       set_stmt_error(stmt, CR_PARAMS_NOT_BOUND, unknown_sqlstate);
       DBUG_RETURN(1);
     }
+
     if (mysql->status != MYSQL_STATUS_READY ||
         mysql->server_status & SERVER_MORE_RESULTS_EXISTS)
     {