From 32b66455859a0bc43ed487fe7e2ca47d5cf81e1c Mon Sep 17 00:00:00 2001
From: "seer-by-sentry[bot]"
 <157164994+seer-by-sentry[bot]@users.noreply.github.com>
Date: Sat, 3 Jan 2026 16:33:34 +0000
Subject: [PATCH] Fix MultiByteToWideChar buffer sizing and allocation

---
 .../GameNetwork/GameSpy/Thread/ThreadUtils.cpp       | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/Core/GameEngine/Source/GameNetwork/GameSpy/Thread/ThreadUtils.cpp b/Core/GameEngine/Source/GameNetwork/GameSpy/Thread/ThreadUtils.cpp
index fedf8d86988..99bd44666e2 100644
--- a/Core/GameEngine/Source/GameNetwork/GameSpy/Thread/ThreadUtils.cpp
+++ b/Core/GameEngine/Source/GameNetwork/GameSpy/Thread/ThreadUtils.cpp
@@ -32,8 +32,14 @@
 
 std::wstring MultiByteToWideCharSingleLine( const char *orig )
 {
-	Int len = strlen(orig);
-	WideChar *dest = NEW WideChar[len+1];
+	// First, get the required buffer size in wide characters
+	Int len = MultiByteToWideChar(CP_UTF8, 0, orig, -1, NULL, 0);
+	if (len <= 0)
+	{
+		return std::wstring();
+	}
+	
+	WideChar *dest = NEW WideChar[len];
 
 	MultiByteToWideChar(CP_UTF8, 0, orig, -1, dest, len);
 	WideChar *c = NULL;
@@ -56,7 +62,7 @@ std::wstring MultiByteToWideCharSingleLine( const char *orig )
 	}
 	while ( c != NULL );
 
-	dest[len] = 0;
+	dest[len-1] = 0;
 	std::wstring ret = dest;
 	delete[] dest;
 	return ret;