From b8c7a29b8409f1f95abbbb23371ed31a41d2dea1 Mon Sep 17 00:00:00 2001
From: Brian Fiete <bfiete@gmail.com>
Date: Wed, 2 Feb 2022 07:50:25 -0500
Subject: [PATCH] OOB protection in GetLineCharAtIdx

---
 IDEHelper/Compiler/BfParser.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/IDEHelper/Compiler/BfParser.cpp b/IDEHelper/Compiler/BfParser.cpp
index d72553da..d721244a 100644
--- a/IDEHelper/Compiler/BfParser.cpp
+++ b/IDEHelper/Compiler/BfParser.cpp
@@ -239,7 +239,16 @@ int BfParserData::GetCharIdAtIndex(int findIndex)
 }
 
 void BfParserData::GetLineCharAtIdx(int idx, int& line, int& lineChar)
-{
+{	
+	if (mJumpTableSize <= 0)
+	{
+		line = 0;
+		lineChar = 0;
+		return;
+	}
+
+	if (idx >= mSrcLength)
+		idx = mSrcLength - 1;
 	auto* jumpEntry = mJumpTable + (idx / PARSER_JUMPTABLE_DIVIDE);
 	if (jumpEntry->mCharIdx > idx)
 		jumpEntry--;