Bug 283532 OOM crash [@ jsdValue::GetProperties]

patch by b.jacques@planet.nl r=rginda sr=brendan a=brendan

js/jsd/jsd_xpc.cpp

@@ -2169,20 +2169,20 @@ NS_IMETHODIMP
 jsdValue::GetProperties (jsdIProperty ***propArray, PRUint32 *length)
 {
     ASSERT_VALID_EPHEMERAL;
+    *propArray = nsnull;
+    if (length)
+        *length = 0;
+
     PRUint32 prop_count = JSD_IsValueObject(mCx, mValue)
         ? JSD_GetCountOfProperties (mCx, mValue)
         : 0;
-    if (!prop_count) {
-        if (length)
-            *length = 0;
-        *propArray = 0;
-        return NS_OK;
-    }
+    NS_ENSURE_TRUE(prop_count, NS_OK);
 
     jsdIProperty **pa_temp =
         NS_STATIC_CAST(jsdIProperty **,
                        nsMemory::Alloc(sizeof (jsdIProperty *) * 
                                        prop_count));
+    NS_ENSURE_TRUE(pa_temp, NS_ERROR_OUT_OF_MEMORY);
 
     PRUint32     i    = 0;
     JSDProperty *iter = NULL;