From 8a14b3bd0e03ebdb627823b37326c5493def343d Mon Sep 17 00:00:00 2001
From: Jean-Yves Avenard <jyavenard@mozilla.com>
Date: Fri, 16 Dec 2016 16:20:06 +1100
Subject: [PATCH] Bug 1323847: P3. Don't allocate data for empty buffer.
 r=gerald

MozReview-Commit-ID: I67RmFZpRDy

--HG--
extra : rebase_source : 19dcb4530dd053dc4b8735d872a4cb2e7adc2a6e
---
 dom/media/MediaData.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/dom/media/MediaData.h b/dom/media/MediaData.h
index 98904e311afc..88c5e6d92711 100644
--- a/dom/media/MediaData.h
+++ b/dom/media/MediaData.h
@@ -220,6 +220,10 @@ private:
   // Returns false if memory couldn't be allocated.
   bool EnsureCapacity(size_t aLength)
   {
+    if (!aLength) {
+      // No need to allocate a buffer yet.
+      return true;
+    }
     const CheckedInt<size_t> sizeNeeded =
       CheckedInt<size_t>(aLength) * sizeof(Type) + AlignmentPaddingSize();