From 2dc1d9cd2be94e7217bf29b7f3dbc6f8433a7063 Mon Sep 17 00:00:00 2001
From: sotaro <sotaro.ikeda.g@gmail.com>
Date: Tue, 9 Feb 2021 10:26:19 +0000
Subject: [PATCH] Bug 1691640 - Add nullptr check to MapTexture() r=mattwoodrow

Differential Revision: https://phabricator.services.mozilla.com/D104498
---
 gfx/webrender_bindings/RenderD3D11TextureHost.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gfx/webrender_bindings/RenderD3D11TextureHost.cpp b/gfx/webrender_bindings/RenderD3D11TextureHost.cpp
index c94692e94e59..fcfe30b7c8b6 100644
--- a/gfx/webrender_bindings/RenderD3D11TextureHost.cpp
+++ b/gfx/webrender_bindings/RenderD3D11TextureHost.cpp
@@ -76,6 +76,10 @@ static bool MapTexture(T* aHost, RenderCompositor* aCompositor,
                        RefPtr<ID3D11DeviceContext>& aDeviceContext,
                        RefPtr<ID3D11Texture2D>& aCpuTexture,
                        D3D11_MAPPED_SUBRESOURCE& aMappedSubresource) {
+  if (!aCompositor) {
+    return false;
+  }
+
   RenderCompositorD3D11SWGL* compositor =
       aCompositor->AsRenderCompositorD3D11SWGL();
   if (!compositor) {