Deny serialization of finfo objects

The resulting objects were already unusable, make it error out
earlier.

Author: nikic

ext/fileinfo/fileinfo.c

@@ -35,6 +35,7 @@
 #include "fileinfo_arginfo.h"
 #include "fopen_wrappers.h" /* needed for is_url */
 #include "Zend/zend_exceptions.h"
+#include "Zend/zend_interfaces.h"
 
 /* {{{ macros and type definitions */
 typedef struct _php_fileinfo {
@@ -132,8 +133,10 @@ PHP_MINIT_FUNCTION(finfo)
 {
 	zend_class_entry _finfo_class_entry;
 	INIT_CLASS_ENTRY(_finfo_class_entry, "finfo", class_finfo_methods);
-	_finfo_class_entry.create_object = finfo_objects_new;
 	finfo_class_entry = zend_register_internal_class(&_finfo_class_entry);
+	finfo_class_entry->create_object = finfo_objects_new;
+	finfo_class_entry->serialize = zend_class_serialize_deny;
+	finfo_class_entry->unserialize = zend_class_unserialize_deny;
 
 	/* copy the standard object handlers to you handler table */
 	memcpy(&finfo_object_handlers, &std_object_handlers, sizeof(zend_object_handlers));

ext/fileinfo/tests/clone_serialize.phpt

@@ -14,12 +14,12 @@ try {
 try {
     $finfo3 = unserialize(serialize($finfo));
     var_dump($finfo3->buffer("Test string"));
-} catch (Error $e) {
+} catch (Exception $e) {
     echo $e->getMessage(), "\n";
 }
 
 ?>
 --EXPECTF--
 string(%d) "%s"
 Trying to clone an uncloneable object of class finfo
-Invalid finfo object
+Serialization of 'finfo' is not allowed