From b4306c04688c778b01f118dbac709d2a20bc136a Mon Sep 17 00:00:00 2001
From: Paul Adenot <paul@paul.cx>
Date: Fri, 11 Feb 2022 13:58:13 +0000
Subject: [PATCH] [DOM media] Handle truncated WAV stream.

---
 dom/media/wave/WaveDemuxer.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dom/media/wave/WaveDemuxer.cpp b/dom/media/wave/WaveDemuxer.cpp
index 387a756759..5243909dec 100644
--- a/dom/media/wave/WaveDemuxer.cpp
+++ b/dom/media/wave/WaveDemuxer.cpp
@@ -611,7 +611,8 @@ WAVTrackDemuxer::Read(uint8_t* aBuffer, int64_t aOffset, int32_t aSize)
 {
   const int64_t streamLen = StreamLength();
   if (mInfo && streamLen > 0) {
-    aSize = std::min<int64_t>(aSize, streamLen - aOffset);
+    int64_t max = streamLen > aOffset ? streamLen - aOffset : 0;
+    aSize = std::min<int64_t>(aSize, max);
   }
   uint32_t read = 0;
   const nsresult rv = mSource.ReadAt(aOffset,