From 06071f2f5fd63b49552cc0c531db64a4cbedb0b9 Mon Sep 17 00:00:00 2001
From: Benjamin Renard <brenard@easter-eggs.com>
Date: Mon, 25 Oct 2021 17:48:58 +0200
Subject: [PATCH] LStemplate: detect and stop template displaying loop

---
 src/includes/class/class.LStemplate.php | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/includes/class/class.LStemplate.php b/src/includes/class/class.LStemplate.php
index c77732be..cb8d0a01 100644
--- a/src/includes/class/class.LStemplate.php
+++ b/src/includes/class/class.LStemplate.php
@@ -90,6 +90,9 @@ class LStemplate extends LSlog_staticLoggerClass {
     'top.tpl', 'bottom.tpl',
   );
 
+  // Keep trace of last displayed template (for loop detection)
+  private static $last_displayed_template = null;
+
  /**
   * Start LStemplate
   *
@@ -419,6 +422,12 @@ class LStemplate extends LSlog_staticLoggerClass {
     // Trigger displaying event
     self :: fireEvent('displaying');
 
+    // Handle loop detection
+    if (self :: $last_displayed_template == $template) {
+       self :: log_error("display($template): loop detected, stop");
+       return;
+    }
+
     try {
       self :: assignCommonVars();
       self :: $_smarty -> display("ls:$template");