Fix bug #77849 Disable cloning of PDO handle/connection objects to avoid segfault

NEWS

@@ -14,6 +14,10 @@ PHP                                                                        NEWS
   . Fixed bug #77827 (preg_match does not ignore \r in regex flags). (requinix,
     cmb)
 
+- PDO:
+  . Fixed bug #77849 (Disable cloning of PDO handle/connection objects).
+    (camporter)
+
 - phpdbg:
   . Fixed bug #76801 (too many open files). (alekitto)
   . Fixed bug #77800 (phpdbg segfaults on listing some conditional breakpoints).

ext/pdo/pdo_dbh.c

@@ -1403,6 +1403,7 @@ void pdo_dbh_init(void)
 	pdo_dbh_object_handlers.offset = XtOffsetOf(pdo_dbh_object_t, std);
 	pdo_dbh_object_handlers.dtor_obj = zend_objects_destroy_object;
 	pdo_dbh_object_handlers.free_obj = pdo_dbh_free_storage;
+	pdo_dbh_object_handlers.clone_obj = NULL;
 	pdo_dbh_object_handlers.get_method = dbh_method_get;
 	pdo_dbh_object_handlers.compare_objects = dbh_compare;
 	pdo_dbh_object_handlers.get_gc = dbh_get_gc;

ext/pdo/tests/bug_77849.phpt

@@ -0,0 +1,23 @@
+--TEST--
+PDO Common: Bug #77849 (Unexpected segfault attempting to use cloned PDO object)
+--SKIPIF--
+<?php
+if (!extension_loaded('pdo')) die('skip');
+$dir = getenv('REDIR_TEST_DIR');
+if (false == $dir) die('skip no driver');
+require_once $dir . 'pdo_test.inc';
+PDOTest::skip();
+?>
+--FILE--
+<?php
+if (getenv('REDIR_TEST_DIR') === false) putenv('REDIR_TEST_DIR='.dirname(__FILE__) . '/../../pdo/tests/');
+require_once getenv('REDIR_TEST_DIR') . 'pdo_test.inc';
+
+$db = PDOTest::factory();
+$db2 = clone $db;
+?>
+--EXPECTF--
+Fatal error: Uncaught Error: Trying to clone an uncloneable object of class PDO in %s
+Stack trace:
+#0 {main}
+  thrown in %s on line %d