Don't use SVG resource documents with an unrecognized MIME-type

third_party/WebKit/Source/core/fetch/DocumentResource.cpp

Index: third_party/WebKit/Source/core/fetch/DocumentResource.cpp
diff --git a/third_party/WebKit/Source/core/fetch/DocumentResource.cpp b/third_party/WebKit/Source/core/fetch/DocumentResource.cpp
index aab75f75f9c939b780a973889aa8041dcfd10c7e..d076e1ad6b38d9a33360100f2e9760fb45edfc03 100644
--- a/third_party/WebKit/Source/core/fetch/DocumentResource.cpp
+++ b/third_party/WebKit/Source/core/fetch/DocumentResource.cpp
@@ -67,7 +67,7 @@ String DocumentResource::encoding() const
 
 void DocumentResource::checkNotify()
 {
-    if (m_data) {
+    if (m_data && mimeTypeAllowed()) {
         StringBuilder decodedText;
         decodedText.append(m_decoder->decode(m_data->data(), m_data->size()));
         decodedText.append(m_decoder->flush());
@@ -78,6 +78,18 @@ void DocumentResource::checkNotify()
     Resource::checkNotify();
 }
 
+bool DocumentResource::mimeTypeAllowed() const
+{
+    ASSERT(type() == SVGDocument);
+    AtomicString mimeType = response().mimeType();
+    if (response().isHTTP())
+        mimeType = httpContentType();
+    return mimeType == "image/svg+xml"
+        || mimeType == "text/xml"
+        || mimeType == "application/xml"
+        || mimeType == "application/xhtml+xml";
+}
+
 PassRefPtrWillBeRawPtr<Document> DocumentResource::createDocument(const KURL& url)
 {
     switch (type()) {