Fix missing error check in curl_multi_init()

Closes GH-13157.

Author: divinity76

NEWS

@@ -6,6 +6,9 @@ PHP                                                                        NEWS
   . Fixed timer leak in zend-max-execution-timers builds. (withinboredom)
   . Fixed bug GH-12349 (linking failure on ARM with mold). (Jan Palus)
 
+- Curl:
+  . Fix missing error check in curl_multi_init(). (divinity76)
+
 - FPM:
   . Fixed bug GH-12996 (Incorrect SCRIPT_NAME with Apache ProxyPassMatch when
     plus in path). (Jakub Zelenka)

ext/curl/multi.c

@@ -60,12 +60,17 @@ static inline php_curlm *curl_multi_from_obj(zend_object *obj) {
 PHP_FUNCTION(curl_multi_init)
 {
 	php_curlm *mh;
+	CURLM *multi;
 
 	ZEND_PARSE_PARAMETERS_NONE();
-
+	multi = curl_multi_init();
+	if (UNEXPECTED(multi == NULL)) {
+		zend_throw_error(NULL, "%s(): Could not initialize a new cURL multi handle", get_active_function_name());
+		RETURN_THROWS();
+	}
 	object_init_ex(return_value, curl_multi_ce);
 	mh = Z_CURL_MULTI_P(return_value);
-	mh->multi = curl_multi_init();
+	mh->multi = multi;
 
 	zend_llist_init(&mh->easyh, sizeof(zval), _php_curl_multi_cleanup_list, 0);
 }