Fix GH-24523: UAF in zend_test_compile_to_ast() on parse error (#24524)

Author: lazerg

ext/zend_test/test.c

@@ -1976,6 +1976,9 @@ static PHP_FUNCTION(zend_test_compile_to_ast)
 
 	zend_arena *ast_arena;
 	zend_ast *ast = zend_compile_string_to_ast(str, &ast_arena, ZSTR_EMPTY_ALLOC());
+	if (!ast) {
+		RETURN_THROWS();
+	}
 
 	zend_string *result = zend_ast_export("", ast, "");
 

ext/zend_test/tests/gh24523.phpt

@@ -0,0 +1,16 @@
+--TEST--
+GH-24523 (UAF in zend_test_compile_to_ast() on parse error)
+--EXTENSIONS--
+zend_test
+--FILE--
+<?php
+
+try {
+    zend_test_compile_to_ast("<?php (");
+} catch (ParseError $e) {
+    echo $e->getMessage(), "\n";
+}
+
+?>
+--EXPECT--
+Unclosed '('