--- xen-4.5.1/tools/qemu-xen-traditional/hw/e1000.c.orig	2015-06-09 16:32:24.000000000 +0100
+++ xen-4.5.1/tools/qemu-xen-traditional/hw/e1000.c	2015-09-26 17:16:36.406544380 +0100
@@ -461,7 +461,8 @@
                 memmove(tp->data, tp->header, hdr);
                 tp->size = hdr;
             }
-        } while (split_size -= bytes);
+            split_size -= bytes;
+        } while (bytes && split_size);
     } else if (!tp->tse && tp->cptse) {
         // context descriptor TSE is not set, while data descriptor TSE is set
         DBGOUT(TXERR, "TCP segmentaion Error\n");