From e69b3f567c4b8957cc09ba4359e84939f77781c5 Mon Sep 17 00:00:00 2001
From: wolfbeast <mcwerewolf@wolfbeast.com>
Date: Mon, 27 May 2019 19:19:27 +0200
Subject: Improve origin-clean algorithm

---
 layout/base/nsLayoutUtils.cpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'layout')

diff --git a/layout/base/nsLayoutUtils.cpp b/layout/base/nsLayoutUtils.cpp
index 07befdc81..17ece8e61 100644
--- a/layout/base/nsLayoutUtils.cpp
+++ b/layout/base/nsLayoutUtils.cpp
@@ -8,6 +8,7 @@
 
 #include "mozilla/ArrayUtils.h"
 #include "mozilla/BasicEvents.h"
+#include "mozilla/dom/CanvasUtils.h"
 #include "mozilla/ClearOnShutdown.h"
 #include "mozilla/EffectCompositor.h"
 #include "mozilla/EffectSet.h"
@@ -7285,10 +7286,10 @@ nsLayoutUtils::SurfaceFromElement(nsIImageLoadingContent* aElement,
   }
 
   result.mPrincipal = principal.forget();
-  // no images, including SVG images, can load content from another domain.
-  result.mIsWriteOnly = false;
   result.mImageRequest = imgRequest.forget();
   return result;
+  result.mIsWriteOnly =
+      CanvasUtils::CheckWriteOnlySecurity(result.mCORSUsed, result.mPrincipal);  
 }
 
 nsLayoutUtils::SurfaceFromElementResult
@@ -7400,7 +7401,8 @@ nsLayoutUtils::SurfaceFromElement(HTMLVideoElement* aElement,
   result.mHasSize = true;
   result.mSize = result.mLayersImage->GetSize();
   result.mPrincipal = principal.forget();
-  result.mIsWriteOnly = false;
+  result.mIsWriteOnly =
+      CanvasUtils::CheckWriteOnlySecurity(result.mCORSUsed, result.mPrincipal);
 
   return result;
 }
-- 
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