Index: fw4/class/CDC/cdc.c
===================================================================
--- fw4.orig/class/CDC/cdc.c	2011-02-08 17:11:11.000000000 -0300
+++ fw4/class/CDC/cdc.c	2011-02-08 17:12:30.000000000 -0300
@@ -76,7 +76,10 @@
 {
     U8 i;
     usb_pcb_t *pcb = usb_pcb_get();
-    
+
+    if (req->type & TYPE_CLASS)
+	goto reject;
+
     switch (req->req)
     {
     case GET_LINE_CODING:
@@ -127,6 +130,7 @@
         break;
 
     default:
+    reject:
         ep_set_stall(EP_CTRL);
         break;
     }
Index: fw4/usb/ctrl.c
===================================================================
--- fw4.orig/usb/ctrl.c	2011-02-08 17:09:02.000000000 -0300
+++ fw4/usb/ctrl.c	2011-02-08 17:12:51.000000000 -0300
@@ -277,7 +277,7 @@
     reqp = (req_t *)req;
 
     // decode the standard request
-    if (!(reqp->type & TYPE_CLASS))
+    if (!(reqp->type & (TYPE_CLASS | TYPE_VENDOR)))
     {
         // this is a standard request
         switch (reqp->req)