ext/mbstring: Check encoding passed to mb_http_output() has no null bytes

Author: Girgias

UPGRADING

@@ -26,6 +26,10 @@ PHP 8.4 UPGRADE NOTES
     Consult sections 2. New Features and 6. New Functions for a list of
     newly implemented methods and constants.
 
+- MBString:
+  . mb_http_output() now checks that the $encoding parameter does not
+    contain any null bytes. If it does, a ValueError is now thrown.
+
 - PDO_PGSQL:
   . The DSN's credentials, when set, are given priority over their PDO
     constructor counterparts, being closer to the documentation states.

ext/mbstring/mbstring.c

@@ -1330,7 +1330,7 @@ PHP_FUNCTION(mb_http_output)
 
 	ZEND_PARSE_PARAMETERS_START(0, 1)
 		Z_PARAM_OPTIONAL
-		Z_PARAM_STRING_OR_NULL(name, name_len)
+		Z_PARAM_PATH_OR_NULL(name, name_len) /* For null byte check */
 	ZEND_PARSE_PARAMETERS_END();
 
 	if (name == NULL) {