Merge pull request #4085 from magento-arcticfoxes/MC-15873-2

 MC-15873: Catch unserializer exception

Author: joanhe

app/code/Magento/Config/Model/Config/Backend/Serialized.php

@@ -9,6 +9,8 @@
 use Magento\Framework\Serialize\Serializer\Json;
 
 /**
+ * Serialized backend model
+ *
  * @api
  * @since 100.0.2
  */
@@ -46,17 +48,32 @@ public function __construct(
     }
 
     /**
+     * Processing object after load data
+     *
      * @return void
      */
     protected function _afterLoad()
     {
         $value = $this->getValue();
         if (!is_array($value)) {
-            $this->setValue(empty($value) ? false : $this->serializer->unserialize($value));
+            try {
+                $this->setValue(empty($value) ? false : $this->serializer->unserialize($value));
+            } catch (\Exception $e) {
+                $this->_logger->critical(
+                    sprintf(
+                        'Failed to unserialize %s config value. The error is: %s',
+                        $this->getPath(),
+                        $e->getMessage()
+                    )
+                );
+                $this->setValue(false);
+            }
         }
     }
 
     /**
+     * Processing object before save data
+     *
      * @return $this
      */
     public function beforeSave()

app/code/Magento/Config/Test/Unit/Model/Config/Backend/SerializedTest.php

@@ -9,7 +9,11 @@
 use Magento\Framework\Model\Context;
 use Magento\Framework\Serialize\Serializer\Json;
 use Magento\Framework\TestFramework\Unit\Helper\ObjectManager;
+use Psr\Log\LoggerInterface;
 
+/**
+ * Class SerializedTest
+ */
 class SerializedTest extends \PHPUnit\Framework\TestCase
 {
     /** @var \Magento\Config\Model\Config\Backend\Serialized */
@@ -18,14 +22,20 @@ class SerializedTest extends \PHPUnit\Framework\TestCase
     /** @var Json|\PHPUnit_Framework_MockObject_MockObject */
     private $serializerMock;
 
+    /** @var LoggerInterface|\PHPUnit_Framework_MockObject_MockObject */
+    private $loggerMock;
+
     protected function setUp()
     {
         $objectManager = new ObjectManager($this);
         $this->serializerMock = $this->createMock(Json::class);
+        $this->loggerMock = $this->createMock(LoggerInterface::class);
         $contextMock = $this->createMock(Context::class);
         $eventManagerMock = $this->createMock(\Magento\Framework\Event\ManagerInterface::class);
         $contextMock->method('getEventDispatcher')
             ->willReturn($eventManagerMock);
+        $contextMock->method('getLogger')
+            ->willReturn($this->loggerMock);
         $this->serializedConfig = $objectManager->getObject(
             Serialized::class,
             [
@@ -72,6 +82,20 @@ public function afterLoadDataProvider()
         ];
     }
 
+    public function testAfterLoadWithException()
+    {
+        $value = '{"key":';
+        $expected = false;
+        $this->serializedConfig->setValue($value);
+        $this->serializerMock->expects($this->once())
+            ->method('unserialize')
+            ->willThrowException(new \Exception());
+        $this->loggerMock->expects($this->once())
+            ->method('critical');
+        $this->serializedConfig->afterLoad();
+        $this->assertEquals($expected, $this->serializedConfig->getValue());
+    }
+
     /**
      * @param string $expected
      * @param int|double|string|array|boolean|null $value