ext/pgsql: Fix segfaults when attemting to fetch row into a non-instantiable class name

Author: Girgias

ext/pgsql/pgsql.c

@@ -1876,6 +1876,11 @@ static void php_pgsql_fetch_hash(INTERNAL_FUNCTION_PARAMETERS, zend_long result_
 
 		ZVAL_COPY_VALUE(&dataset, return_value);
 		object_init_ex(return_value, ce);
+		if (UNEXPECTED(EG(exception))) {
+			zval_ptr_dtor(&dataset);
+			zval_ptr_dtor(return_value);
+			RETURN_THROWS();
+		}
 		if (!ce->default_properties_count && !ce->__set) {
 			Z_OBJ_P(return_value)->properties = Z_ARR(dataset);
 		} else {

ext/pgsql/tests/pg_fetch_object_with_abstract_class.phpt

@@ -0,0 +1,58 @@
+--TEST--
+pg_fetch_object() with abstract class name
+--EXTENSIONS--
+pgsql
+--SKIPIF--
+<?php
+include("skipif.inc");
+?>
+--FILE--
+<?php
+
+interface I {}
+
+abstract class C {}
+
+enum E {
+	case A;
+}
+
+include "config.inc";
+$table_name = "pg_fetch_object_abstract_class";
+$db = pg_connect($conn_str);
+pg_query($db, "CREATE TABLE {$table_name} (a integer, b text)");
+pg_query($db, "INSERT INTO {$table_name} VALUES(0, 'ABC')");
+
+$sql = "SELECT * FROM $table_name WHERE a = 0";
+
+try {
+	$result = pg_query($db, $sql);
+	var_dump(pg_fetch_object($result, NULL, 'I'));
+} catch(Throwable $e) {
+	echo $e::class, ': ', $e->getMessage(), PHP_EOL;
+}
+
+try {
+	$result = pg_query($db, $sql);
+	var_dump(pg_fetch_object($result, NULL, 'C'));
+} catch(Throwable $e) {
+	echo $e::class, ': ', $e->getMessage(), PHP_EOL;
+}
+
+try {
+	$result = pg_query($db, $sql);
+	var_dump(pg_fetch_object($result, NULL, 'E'));
+} catch(Throwable $e) {
+	echo $e::class, ': ', $e->getMessage(), PHP_EOL;
+}
+
+--CLEAN--
+<?php
+include('config.inc');
+$db = pg_connect($conn_str);
+pg_query($db, "DROP TABLE IF EXISTS pg_fetch_object_abstract_class cascade");
+?>
+--EXPECT--
+Error: Cannot instantiate interface I
+Error: Cannot instantiate abstract class C
+Error: Cannot instantiate enum E