From 9b114e7886f4dcd048fa3fbc5434c2c2706a03fd Mon Sep 17 00:00:00 2001
From: myT <mighty.cow@mailinator.com>
Date: Fri, 8 Apr 2022 21:41:26 +0200
Subject: [PATCH] fixed music playback crash in CPMA credits with s_musicvolume
 > 0

---
 code/client/snd_dma.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/code/client/snd_dma.cpp b/code/client/snd_dma.cpp
index cb73946..098f66d 100644
--- a/code/client/snd_dma.cpp
+++ b/code/client/snd_dma.cpp
@@ -1037,6 +1037,11 @@ static void S_UpdateBackgroundTrack()
 		// decide how much data needs to be read from the file
 		fileSamples = bufferSamples * s_backgroundStream->info.rate / dma.speed;
 
+		// fileSamples can become 0 when dma.speed > s_backgroundStream->info.rate
+		if ( fileSamples <= 0 ) {
+			break;
+		}
+
 		// our max buffer size
 		fileBytes = fileSamples * (s_backgroundStream->info.width * s_backgroundStream->info.channels);
 		if ( fileBytes > sizeof(raw) ) {