add testSearchQueryInfiniteLoopEmptyLiteral().

tests/SearchPluginTest.php

@@ -526,4 +526,32 @@ class SearchPluginTest extends \PHPUnit_Framework_TestCase {
         $this->assertEquals(400, $response->getStatus());
     }
 
+	public function testSearchQueryInfiniteLoopEmptyLiteral() {
+		$this->searchBackend->expects($this->any())
+			->method('getArbiterPath')
+			->willReturn('foo');
+
+		$plugin = new SearchPlugin($this->searchBackend);
+		$server = new Server();
+		$plugin->initialize($server);
+
+		$request = new Request('SEARCH', '/index.php/foo', [
+			'Content-Type' => 'text/xml'
+		]);
+		$request->setBaseUrl('/index.php');
+		$request->setBody(fopen(__DIR__ . '/infiniteloopemptyliteral.xml', 'r'));
+		$response = new Response();
+
+		$this->searchBackend->expects($this->any())
+			->method('isValidScope')
+			->willReturn(true);
+
+		$this->searchBackend->expects($this->never())
+			->method('search');
+
+		$plugin->searchHandler($request, $response);
+
+		$this->assertEquals(400, $response->getStatus());
+	}
+
 }

tests/infiniteloopemptyliteral.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<d:searchrequest xmlns:d="DAV:" xmlns:oc="http://nextcloud.com/ns">
+    <d:basicsearch>
+        <d:select>
+            <d:prop>
+                <d:displayname/>
+                <d:getcontenttype/>
+                <d:resourcetype/>
+                <d:getcontentlength/>
+                <d:getlastmodified/>
+                <d:creationdate/>
+                <d:getetag/>
+                <d:quota-used-bytes/>
+                <d:quota-available-bytes/>
+                <oc:permissions xmlns:oc="http://owncloud.org/ns"/>
+                <oc:id xmlns:oc="http://owncloud.org/ns"/>
+                <oc:size xmlns:oc="http://owncloud.org/ns"/>
+                <oc:favorite xmlns:oc="http://owncloud.org/ns"/>
+            </d:prop>
+        </d:select>
+        <d:from>
+            <d:scope>
+                <d:href>/files/naofumi</d:href>
+                <d:depth>infinity</d:depth>
+            </d:scope>
+        </d:from>
+        <d:where><d:like><d:prop/><d:literal/></d:like></d:where>
+        <d:orderby/>
+    </d:basicsearch>
+</d:searchrequest>