MAGETWO-69015: Cannot login as admin user with limited user role

Author: Alex Paliarush

app/code/Magento/Store/Model/Config/Processor/Fallback.php

@@ -59,7 +59,12 @@ class Fallback implements PostProcessorInterface
 
     /**
      * Fallback constructor.
+     *
      * @param Scopes $scopes
+     * @param ResourceConnection $resourceConnection
+     * @param Store $storeResource
+     * @param Website $websiteResource
+     * @param DeploymentConfig $deploymentConfig
      */
     public function __construct(
         Scopes $scopes,

app/code/Magento/Store/Model/ResourceModel/Website.php

@@ -15,11 +15,6 @@
  */
 class Website extends \Magento\Framework\Model\ResourceModel\Db\AbstractDb
 {
-    /**
-     * @var array
-     */
-    private $websitesCache;
-
     /**
      * Define main table
      *

lib/internal/Magento/Framework/App/Config/InitialConfigSource.php

@@ -49,6 +49,9 @@ public function __construct(Reader $reader, $configType, $fileKey = null)
     public function get($path = '')
     {
         $data = new DataObject($this->reader->load());
-        return $data->getData($this->configType) ?: [];
+        if ($path !== '' && $path !== null) {
+            $path = '/' . $path;
+        }
+        return $data->getData($this->configType . $path) ?: [];
     }
 }

lib/internal/Magento/Framework/App/Test/Unit/Config/InitialConfigSourceTest.php

@@ -41,6 +41,6 @@ public function testGet()
         $this->reader->expects($this->once())
             ->method('load')
             ->willReturn([$this->configType => [$path => 'value']]);
-        $this->assertEquals([$path => 'value'], $this->source->get());
+        $this->assertEquals('value', $this->source->get($path));
     }
 }