diff --git a/core/lib/Drupal/Core/Config/Config.php b/core/lib/Drupal/Core/Config/Config.php
index 51ade6c..bd0ccc4 100644
--- a/core/lib/Drupal/Core/Config/Config.php
+++ b/core/lib/Drupal/Core/Config/Config.php
@@ -68,6 +68,8 @@ class Config extends StorableConfigBase {
    *   The typed configuration manager service.
    */
   public function __construct($name, StorageInterface $storage, EventDispatcherInterface $event_dispatcher, TypedConfigManagerInterface $typed_config) {
+    // Validate the configuration object name.
+    static::validateName($name);
     $this->name = $name;
     $this->storage = $storage;
     $this->eventDispatcher = $event_dispatcher;
@@ -204,9 +206,6 @@ public function clear($key) {
    * {@inheritdoc}
    */
   public function save() {
-    // Validate the configuration object name before saving.
-    static::validateName($this->name);
-
     // If there is a schema for this configuration object, cast all values to
     // conform to the schema.
     if ($this->typedConfigManager->hasConfigSchema($this->name)) {
diff --git a/core/lib/Drupal/Core/Config/ConfigBase.php b/core/lib/Drupal/Core/Config/ConfigBase.php
index eee76a2..f89b1e5 100644
--- a/core/lib/Drupal/Core/Config/ConfigBase.php
+++ b/core/lib/Drupal/Core/Config/ConfigBase.php
@@ -80,6 +80,8 @@ public function getName() {
    *   The configuration object.
    */
   public function setName($name) {
+    // Validate the configuration object.
+    static::validateName($name);
     $this->name = $name;
     return $this;
   }
@@ -87,6 +89,11 @@ public function setName($name) {
   /**
    * Validates the configuration object name.
    *
+   * A valid name must:
+   * - Be namespaced by its owner (i.e. contain at least one '.').
+   * - Be shorter than Config::MAX_NAME_LENGTH characters.
+   * - Not contain any of the following characters: ? : * < > " ' / \
+   *
    * @param string $name
    *  The name of the configuration object.
    *
@@ -95,7 +102,7 @@ public function setName($name) {
    * @see Config::MAX_NAME_LENGTH
    */
   public static function validateName($name) {
-    // The name must be namespaced by owner.
+    // The name must be namespaced by its owner.
     if (strpos($name, '.') === FALSE) {
       throw new ConfigNameException(SafeMarkup::format('Missing namespace in Config object name @name.', array(
         '@name' => $name,