From 26c0c8a21162f60b15e29821bcd98834b9455ec4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Sch=C3=BCrmann?= <daschuer@mixxx.org>
Date: Fri, 22 Nov 2024 08:21:21 +0100
Subject: [PATCH] Fix read before m_bufferInt during scratching

---
 src/engine/bufferscalers/enginebufferscalelinear.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/engine/bufferscalers/enginebufferscalelinear.cpp b/src/engine/bufferscalers/enginebufferscalelinear.cpp
index a461dd21cb6..55f2f804510 100644
--- a/src/engine/bufferscalers/enginebufferscalelinear.cpp
+++ b/src/engine/bufferscalers/enginebufferscalelinear.cpp
@@ -85,9 +85,12 @@ double EngineBufferScaleLinear::scaleBuffer(
         // reset m_floorSampleOld in a way as we were coming from
         // the other direction
         SINT iNextSample = getOutputSignal().frames2samples(static_cast<SINT>(ceil(m_dNextFrame)));
-        if (iNextSample + 1 < m_bufferIntSize) {
+        if (iNextSample >= 0 && iNextSample + 1 < m_bufferIntSize) {
             m_floorSampleOld[0] = m_bufferInt[iNextSample];
             m_floorSampleOld[1] = m_bufferInt[iNextSample + 1];
+        } else {
+            m_floorSampleOld[0] = CSAMPLE_ZERO;
+            m_floorSampleOld[1] = CSAMPLE_ZERO;
         }
 
         // if the buffer has extra samples, do a read so RAMAN ends up back where