Bug 1316539 - Add null pixel check in TexSubImage. r=jgilbert

--HG--
extra : rebase_source : c575f835bfdadf4a24e8e62bdd1ec10dcdda98e1

dom/canvas/WebGLContext.h

@@ -210,6 +210,8 @@ struct TexImageSource
     const dom::Element* mDomElem;
     ErrorResult* mOut_error;
 
+    bool IsNull() const { return (!mView && !mImageData && !mDomElem); }
+
 protected:
     TexImageSource() {
         memset(this, 0, sizeof(*this));

dom/canvas/WebGLTextureUpload.cpp

@@ -445,6 +445,10 @@ WebGLTexture::TexSubImage(const char* funcName, TexImageTarget target, GLint lev
                           GLsizei height, GLsizei depth,
                           const webgl::PackingInfo& pi, const TexImageSource& src)
 {
+    if (src.IsNull()) {
+        mContext->ErrorInvalidValue("%s: Pixels must be non-null.", funcName);
+        return;
+    }
     const GLint border = 0;
     dom::RootedTypedArray<dom::Uint8ClampedArray> scopedArr(dom::RootingCx());
     const auto blob = ValidateTexOrSubImage(mContext, funcName, target, width, height,