From ed48f7f229d4236153cc72f4e05f3820c7407456 Mon Sep 17 00:00:00 2001
From: "Christoph M. Becker" <cmbecker69@gmx.de>
Date: Tue, 23 Mar 2021 16:13:57 +0100
Subject: [PATCH] Fix #73533: Invalid memory access in php_libxml_xmlCheckUTF8

A string passed to `php_libxml_xmlCheckUTF8()` may be longer than
1<<31-1 bytes, so we're better using a `size_t`.
---
 ext/libxml/libxml.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ext/libxml/libxml.c b/ext/libxml/libxml.c
index e21d6fdbbe98c..fc194770e1013 100644
--- a/ext/libxml/libxml.c
+++ b/ext/libxml/libxml.c
@@ -1182,7 +1182,7 @@ static PHP_FUNCTION(libxml_set_external_entity_loader)
 /* {{{ Common functions shared by extensions */
 int php_libxml_xmlCheckUTF8(const unsigned char *s)
 {
-	int i;
+	size_t i;
 	unsigned char c;
 
 	for (i = 0; (c = s[i++]);) {