From 5056e963bab9683656e07e527b339f370383fa77 Mon Sep 17 00:00:00 2001
From: Patric Stout <truebrain@openttd.org>
Date: Fri, 12 Mar 2021 09:26:03 +0100
Subject: [PATCH] Fix #8851: don't allow infinite "exec" depth in script, but
 limit to 10 deep

This means if you execute a script from a script from a script, ..
for more than 10 times, it bails out now. This should be sufficient
for even the most complex scripts.
---
 src/console_cmds.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/console_cmds.cpp b/src/console_cmds.cpp
index f66cfa6b67..f50644cf5b 100644
--- a/src/console_cmds.cpp
+++ b/src/console_cmds.cpp
@@ -960,6 +960,11 @@ DEF_CONSOLE_CMD(ConExec)
 		return true;
 	}
 
+	if (_script_current_depth == 11) {
+		IConsoleError("Maximum 'exec' depth reached; script A is calling script B is calling script C ... more than 10 times.");
+		return true;
+	}
+
 	_script_current_depth++;
 	uint script_depth = _script_current_depth;