Index: /trunk/src/VBox/Devices/Audio/DevIchAc97.cpp
===================================================================
--- /trunk/src/VBox/Devices/Audio/DevIchAc97.cpp	(revision 23980)
+++ /trunk/src/VBox/Devices/Audio/DevIchAc97.cpp	(revision 23981)
@@ -1588,4 +1588,11 @@
 
     Assert(iInstance == 0);
+
+    /*
+     * Validations.
+     */
+    if (!CFGMR3AreValuesValid (pCfgHandle, "\0"))
+        return PDMDEV_SET_ERROR (pDevIns, VERR_PDM_DEVINS_UNKNOWN_CFG_VALUES,
+                                 N_ ("Invalid configuration for the AC97 device"));
 
     /*