From 9504b3da21698180bad9b9248f090c0ba8e1234e Mon Sep 17 00:00:00 2001
From: cutealien <cutealien@dfc29bdd-3216-0410-991c-e03cc46cb475>
Date: Wed, 20 Apr 2022 21:57:25 +0000
Subject: [PATCH] Prevent CMemoryFile to seek to a point before the start.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6348 dfc29bdd-3216-0410-991c-e03cc46cb475
---
 source/Irrlicht/CMemoryFile.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/source/Irrlicht/CMemoryFile.cpp b/source/Irrlicht/CMemoryFile.cpp
index 22c57e65..57064390 100644
--- a/source/Irrlicht/CMemoryFile.cpp
+++ b/source/Irrlicht/CMemoryFile.cpp
@@ -52,14 +52,15 @@ bool CMemoryReadFile::seek(long finalPos, bool relativeMovement)
 {
 	if (relativeMovement)
 	{
-		if (Pos + finalPos > Len)
+		const long newPos = Pos + finalPos;
+		if (newPos > Len || newPos < 0)
 			return false;
 
 		Pos += finalPos;
 	}
 	else
 	{
-		if (finalPos > Len)
+		if (finalPos > Len || finalPos < 0)
 			return false;
 
 		Pos = finalPos;