From ed27d70d9a42d0fd8cd4562c5222ceb9dce9425c Mon Sep 17 00:00:00 2001
From: Ilija Tovilo <ilija.tovilo@me.com>
Date: Mon, 17 Jul 2023 22:30:10 +0200
Subject: [PATCH] Fix use-of-uninitialized-value in start_fake_frame

Closes GH-11732
---
 Zend/zend_execute_API.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Zend/zend_execute_API.c b/Zend/zend_execute_API.c
index 2dd05c24fc3..1e31934f158 100644
--- a/Zend/zend_execute_API.c
+++ b/Zend/zend_execute_API.c
@@ -897,6 +897,8 @@ cleanup_args:
 	}
 
 	if (UNEXPECTED(ZEND_CALL_INFO(call) & ZEND_CALL_MAY_HAVE_UNDEF)) {
+		/* zend_handle_undef_args assumes prev_execute_data is initialized. */
+		call->prev_execute_data = NULL;
 		if (zend_handle_undef_args(call) == FAILURE) {
 			zend_vm_stack_free_args(call);
 			zend_vm_stack_free_call_frame(call);