Update to Drupal 8.1.2. For more information, see https://www.drupal.org/project/drupal/releases/8.1.2

core/modules/config/src/ConfigSubscriber.php

@@ -33,4 +33,5 @@ class ConfigSubscriber extends ConfigImportValidateEventSubscriberBase {
     $events[ConfigEvents::IMPORT_VALIDATE][] = array('onConfigImporterValidate', 20);
     return $events;
   }
+
 }

core/modules/config/src/Controller/ConfigController.php

@@ -160,4 +160,5 @@ class ConfigController implements ContainerInjectionInterface {
 
     return $build;
   }
+
 }

core/modules/config/src/Form/ConfigImportForm.php

@@ -67,13 +67,16 @@ class ConfigImportForm extends FormBase {
    * {@inheritdoc}
    */
   public function validateForm(array &$form, FormStateInterface $form_state) {
-    $file_upload = $this->getRequest()->files->get('files[import_tarball]', NULL, TRUE);
-    if ($file_upload && $file_upload->isValid()) {
-      $form_state->setValue('import_tarball', $file_upload->getRealPath());
-    }
-    else {
-      $form_state->setErrorByName('import_tarball', $this->t('The file could not be uploaded.'));
+    $all_files = $this->getRequest()->files->get('files', []);
+    if (!empty($all_files['import_tarball'])) {
+      $file_upload = $all_files['import_tarball'];
+      if ($file_upload->isValid()) {
+        $form_state->setValue('import_tarball', $file_upload->getRealPath());
+        return;
+      }
     }
+
+    $form_state->setErrorByName('import_tarball', $this->t('The file could not be uploaded.'));
   }
 
   /**

core/modules/config/src/Form/ConfigSingleImportForm.php

@@ -2,6 +2,7 @@
 
 namespace Drupal\config\Form;
 
+use Drupal\Component\Serialization\Exception\InvalidDataTypeException;
 use Drupal\Component\Serialization\Yaml;
 use Drupal\config\StorageReplaceDataWrapper;
 use Drupal\Core\Config\ConfigImporter;
@@ -281,8 +282,13 @@ class ConfigSingleImportForm extends ConfirmFormBase {
       return;
     }
 
-    // Decode the submitted import.
-    $data = Yaml::decode($form_state->getValue('import'));
+    try {
+      // Decode the submitted import.
+      $data = Yaml::decode($form_state->getValue('import'));
+    }
+    catch (InvalidDataTypeException $e) {
+      $form_state->setErrorByName('import', $this->t('The import failed with the following message: %message', ['%message' => $e->getMessage()]));
+    }
 
     // Validate for config entities.
     if ($form_state->getValue('config_type') !== 'system.simple') {
@@ -388,7 +394,7 @@ class ConfigSingleImportForm extends ConfirmFormBase {
     if ($config_importer->alreadyImporting()) {
       drupal_set_message($this->t('Another request may be importing configuration already.'), 'error');
     }
-    else{
+    else {
       try {
         $sync_steps = $config_importer->initialize();
         $batch = [

core/modules/config/src/Form/ConfigSync.php

@@ -330,7 +330,7 @@ class ConfigSync extends FormBase {
     if ($config_importer->alreadyImporting()) {
       drupal_set_message($this->t('Another request may be synchronizing configuration already.'));
     }
-    else{
+    else {
       try {
         $sync_steps = $config_importer->initialize();
         $batch = array(
@@ -411,5 +411,4 @@ class ConfigSync extends FormBase {
     }
   }
 
-
 }

core/modules/config/src/StorageReplaceDataWrapper.php

@@ -196,4 +196,5 @@ class StorageReplaceDataWrapper implements StorageInterface {
     $this->replacementData[$this->collection][$name] = $data;
     return $this;
   }
+
 }

core/modules/config/src/Tests/ConfigEntityTest.php

@@ -195,7 +195,8 @@ class ConfigEntityTest extends WebTestBase {
     try {
       $same_id->save();
       $this->fail('Not possible to overwrite an entity entity.');
-    } catch (EntityStorageException $e) {
+    }
+    catch (EntityStorageException $e) {
       $this->pass('Not possible to overwrite an entity entity.');
     }
 

core/modules/config/src/Tests/ConfigExportImportUITest.php

@@ -226,7 +226,7 @@ class ConfigExportImportUITest extends WebTestBase {
     // Export the configuration.
     $this->drupalPostForm('admin/config/development/configuration/full/export', array(), 'Export');
     $this->tarball = $this->getRawContent();
-    $filename = file_directory_temp() .'/' . $this->randomMachineName();
+    $filename = file_directory_temp() . '/' . $this->randomMachineName();
     file_put_contents($filename, $this->tarball);
 
     // Set up the active storage collections to test import.

core/modules/config/src/Tests/ConfigImportAllTest.php

@@ -60,7 +60,7 @@ class ConfigImportAllTest extends ModuleTestBase {
     \Drupal::service('module_installer')->install(array_keys($all_modules));
 
     $this->assertModules(array_keys($all_modules), TRUE);
-    foreach($all_modules as $module => $info) {
+    foreach ($all_modules as $module => $info) {
       $this->assertModuleConfig($module);
       $this->assertModuleTablesExist($module);
     }
@@ -118,7 +118,7 @@ class ConfigImportAllTest extends ModuleTestBase {
     \Drupal::service('module_installer')->uninstall(array_keys($modules_to_uninstall));
 
     $this->assertModules(array_keys($modules_to_uninstall), FALSE);
-    foreach($modules_to_uninstall as $module => $info) {
+    foreach ($modules_to_uninstall as $module => $info) {
       $this->assertNoModuleConfig($module);
       $this->assertModuleTablesDoNotExist($module);
     }
@@ -133,7 +133,7 @@ class ConfigImportAllTest extends ModuleTestBase {
 
     // Check that all modules that were uninstalled are now reinstalled.
     $this->assertModules(array_keys($modules_to_uninstall), TRUE);
-    foreach($modules_to_uninstall as $module => $info) {
+    foreach ($modules_to_uninstall as $module => $info) {
       $this->assertModuleConfig($module);
       $this->assertModuleTablesExist($module);
     }
@@ -157,4 +157,5 @@ class ConfigImportAllTest extends ModuleTestBase {
       $this->assertConfigSchema($typed_config, $name, $config->get());
     }
   }
+
 }

core/modules/config/src/Tests/ConfigInstallProfileOverrideTest.php

@@ -49,7 +49,7 @@ class ConfigInstallProfileOverrideTest extends WebTestBase {
     // Verify that the original data matches. We have to read the module config
     // file directly, because the install profile default system.cron.yml
     // configuration file was used to create the active configuration.
-    $config_dir = drupal_get_path('module', 'system') . '/'. InstallStorage::CONFIG_INSTALL_DIRECTORY;
+    $config_dir = drupal_get_path('module', 'system') . '/' . InstallStorage::CONFIG_INSTALL_DIRECTORY;
     $this->assertTrue(is_dir($config_dir));
     $source_storage = new FileStorage($config_dir);
     $data = $source_storage->read($config_name);

core/modules/config/src/Tests/ConfigInstallWebTest.php

@@ -187,4 +187,5 @@ class ConfigInstallWebTest extends WebTestBase {
     $this->rebuildContainer();
     $this->assertTrue(entity_load('config_test', 'other_module_test_with_dependency'), 'The config_test.dynamic.other_module_test_with_dependency configuration has been created during install.');
   }
+
 }

core/modules/config/src/Tests/ConfigSingleImportExportTest.php

@@ -37,6 +37,16 @@ class ConfigSingleImportExportTest extends WebTestBase {
     $uuid = \Drupal::service('uuid');
 
     $this->drupalLogin($this->drupalCreateUser(array('import configuration')));
+
+    // Attempt an import with invalid YAML.
+    $edit = [
+      'config_type' => 'action',
+      'import' => '{{{',
+    ];
+
+    $this->drupalPostForm('admin/config/development/configuration/single/import', $edit, t('Import'));
+    $this->assertText('The import failed with the following message: Malformed inline YAML string ({{{) at line 1 (near "{{{")');
+
     $import = <<<EOD
 label: First
 weight: 0