From 35f1bee05385c03c9a694fba0aa3cd1f1566c716 Mon Sep 17 00:00:00 2001
From: adrien <adrien@malingrey.fr>
Date: Sun, 30 Apr 2023 10:59:58 +0200
Subject: [PATCH] update thumbnail

---
 thumbnail.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/thumbnail.php b/thumbnail.php
index a5a2094..1740ee4 100644
--- a/thumbnail.php
+++ b/thumbnail.php
@@ -1,6 +1,6 @@
 <?php
     require("classes.php");
-    if (isset($_GET["grid"]))
+    if (isset($_GET["grid"]) && preg_match("/^[1-9.]{81}$/", $_GET["grid"]))
         $currentGrid = $_GET["grid"];
     else
         $currentGrid = ".528.3....4.9.1...39.562......73.129...1.64.7...42.3656.13.5...28.6.4...4.5287...";