From 030163b1d92aea6cd0c2d268d4997bd7984a376b Mon Sep 17 00:00:00 2001
From: def <dennis@felsin9.de>
Date: Sat, 6 Nov 2021 12:57:31 +0100
Subject: [PATCH] Don't access out of bounds in linereader (fixes #4308)

---
 src/engine/shared/linereader.cpp | 2 +-
 src/engine/shared/linereader.h   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/engine/shared/linereader.cpp b/src/engine/shared/linereader.cpp
index 18868e151..05c97f9af 100644
--- a/src/engine/shared/linereader.cpp
+++ b/src/engine/shared/linereader.cpp
@@ -4,7 +4,7 @@
 
 void CLineReader::Init(IOHANDLE File)
 {
-	m_BufferMaxSize = sizeof(m_aBuffer);
+	m_BufferMaxSize = sizeof(m_aBuffer) - 1;
 	m_BufferSize = 0;
 	m_BufferPos = 0;
 	m_File = File;
diff --git a/src/engine/shared/linereader.h b/src/engine/shared/linereader.h
index b66bcf82b..b97cd40ef 100644
--- a/src/engine/shared/linereader.h
+++ b/src/engine/shared/linereader.h
@@ -7,7 +7,7 @@
 // buffered stream for reading lines, should perhaps be something smaller
 class CLineReader
 {
-	char m_aBuffer[4 * 8192];
+	char m_aBuffer[4 * 8192 + 1]; // 1 additional byte for null termination
 	unsigned m_BufferPos;
 	unsigned m_BufferSize;
 	unsigned m_BufferMaxSize;