From f3a19b8e9b5a70bd5832246588fddd580571528e Mon Sep 17 00:00:00 2001
From: wolfbeast <mcwerewolf@gmail.com>
Date: Tue, 11 Sep 2018 12:48:40 +0200
Subject: [PATCH] Release mapped surface memory on size check failure to plug a
 leak.

---
 dom/base/nsContentUtils.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dom/base/nsContentUtils.cpp b/dom/base/nsContentUtils.cpp
index 2f85c1b7e1..49fe5143f6 100644
--- a/dom/base/nsContentUtils.cpp
+++ b/dom/base/nsContentUtils.cpp
@@ -7990,6 +7990,8 @@ GetSurfaceDataImpl(mozilla::gfx::DataSourceSurface* aSurface,
                                                             &maxBufLen,
                                                             &bufLen);
   if (NS_FAILED(rv)) {
+    // Release mapped memory
+    aSurface->Unmap();
     return GetSurfaceDataContext::NullValue();
   }