--- old/src/windows/native/java/net/NetworkInterface_winXP.c	Tue Apr 30 20:34:49 2013
+++ new/src/windows/native/java/net/NetworkInterface_winXP.c	Tue Apr 30 20:34:49 2013
@@ -818,10 +818,12 @@
       ptr = getAdapter(env, index);
       if (ptr != NULL) {
         len = ptr->PhysicalAddressLength;
-        ret = (*env)->NewByteArray(env, len);
-        if (!IS_NULL(ret)) {
-          (*env)->SetByteArrayRegion(env, ret, 0, len,
-                                     (jbyte*) ptr->PhysicalAddress);
+        if (len > 0) {
+          ret = (*env)->NewByteArray(env, len);
+          if (!IS_NULL(ret)) {
+            (*env)->SetByteArrayRegion(env, ret, 0, len,
+                                       (jbyte*) ptr->PhysicalAddress);
+          }
         }
         free(ptr);
       }