From aa7ab87b211586e7263d4baf75a8781efd68c6e1 Mon Sep 17 00:00:00 2001
From: tildearrow <me@tildearrow.org>
Date: Thu, 14 Aug 2025 04:03:16 -0500
Subject: [PATCH] fix memory corruption when deleting unused samples

---
 src/engine/engine.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index 30a713398..ac6f49044 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -939,6 +939,7 @@ void DivEngine::delUnusedSamples() {
 
   bool* isUsed=new bool[song.sample.size()];
   memset(isUsed,0,song.sample.size()*sizeof(bool));
+  int isUsedMax=((int)song.sample.size())-1;
 
   // scan in instruments
   for (DivInstrument* i: song.ins) {
@@ -1020,10 +1021,10 @@ void DivEngine::delUnusedSamples() {
     if (!isUsed[i]) {
       delSampleUnsafe(i,false);
       // rotate
-      for (int j=i; j<255; j++) {
+      for (int j=i; j<isUsedMax; j++) {
         isUsed[j]=isUsed[j+1];
       }
-      isUsed[255]=true;
+      isUsed[isUsedMax]=true;
       i--;
     }
   }