From 2e8d40b5e382f0f2a8e9c0ba0a19d9d218636934 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=CE=B6eh=20Matt?= <5415177+ZehMatt@users.noreply.github.com>
Date: Fri, 10 Sep 2021 22:08:49 +0300
Subject: [PATCH] Fix out of bounds regression from #15391

---
 src/openrct2/paint/Paint.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/openrct2/paint/Paint.cpp b/src/openrct2/paint/Paint.cpp
index 96d662fcd8..862a5a8b10 100644
--- a/src/openrct2/paint/Paint.cpp
+++ b/src/openrct2/paint/Paint.cpp
@@ -87,7 +87,7 @@ static void PaintSessionAddPSToQuadrant(paint_session* session, paint_struct* ps
     const auto positionHash = RemapPositionToQuadrant(*ps, session->CurrentRotation);
 
     // Values below zero or above MaxPaintQuadrants are void, corners also share the same quadrant as void.
-    const uint32_t paintQuadrantIndex = std::clamp(positionHash / COORDS_XY_STEP, 0, MaxPaintQuadrants);
+    const uint32_t paintQuadrantIndex = std::clamp(positionHash / COORDS_XY_STEP, 0, MaxPaintQuadrants - 1);
 
     ps->quadrant_index = paintQuadrantIndex;
     ps->next_quadrant_ps = session->Quadrants[paintQuadrantIndex];