Fix potential memory leak in XPath evaluation results

Author: nielsdos

NEWS

@@ -8,6 +8,7 @@ PHP                                                                        NEWS
 
 - DOM:
   . Add some missing ZPP checks. (nielsdos)
+  . Fix potential memory leak in XPath evaluation results. (nielsdos)
 
 - Gettext:
   . Fixed sigabrt raised with dcgettext/dcngettext calls with gettext 0.22.5

ext/dom/xpath.c

@@ -125,8 +125,11 @@ static void dom_xpath_ext_function_php(xmlXPathParserContextPtr ctxt, int nargs,
 					}
 				}
 				break;
-			default:
-			ZVAL_STRING(&fci.params[i], (char *)xmlXPathCastToString(obj));
+			default: {
+				str = (char *)xmlXPathCastToString(obj);
+				ZVAL_STRING(&fci.params[i], str);
+				xmlFree(str);
+			}
 		}
 		xmlXPathFreeObject(obj);
 	}