src/windows/native/java/net/NetworkInterface_winXP.c

@@ -816,15 +816,17 @@
       int len;
 
       ptr = getAdapter(env, index);
       if (ptr != NULL) {
         len = ptr->PhysicalAddressLength;
+        if (len > 0) {
         ret = (*env)->NewByteArray(env, len);
         if (!IS_NULL(ret)) {
           (*env)->SetByteArrayRegion(env, ret, 0, len,
                                      (jbyte*) ptr->PhysicalAddress);
         }
+        }
         free(ptr);
       }
       return ret;
 }