--- xen-unstable/tools/ioemu/hw/ne2000.c.cve-2007-1321	2006-07-03 09:51:06.000000000 -0400
+++ xen-unstable/tools/ioemu/hw/ne2000.c	2007-10-30 14:32:59.000000000 -0400
@@ -205,7 +205,7 @@ static void ne2000_receive(void *opaque,
 {
     NE2000State *s = opaque;
     uint8_t *p;
-    int total_len, next, avail, len, index;
+    unsigned int total_len, next, avail, len, index;
     uint8_t buf1[60];
     
 #if defined(DEBUG_NE2000)
@@ -241,7 +241,10 @@ static void ne2000_receive(void *opaque,
 
     /* write packet data */
     while (size > 0) {
-        avail = s->stop - index;
+        if (index <= s->stop)
+            avail = s->stop - index;
+        else
+            avail = 0;
         len = size;
         if (len > avail)
             len = avail;