1 files changed, 19 insertions, 0 deletions
diff --git a/modules/libjar/nsJARChannel.cpp b/modules/libjar/nsJARChannel.cpp
index ee60602da..2f721fa3f 100644
--- a/modules/libjar/nsJARChannel.cpp
+++ b/modules/libjar/nsJARChannel.cpp
@@ -995,6 +995,25 @@ nsJARChannel::OnStartRequest(nsIRequest *req, nsISupports *ctx)
     mRequest = req;
     nsresult rv = mListener->OnStartRequest(this, mListenerContext);
     mRequest = nullptr;
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    // Restrict loadable content types.
+    nsAutoCString contentType;
+    GetContentType(contentType);
+    auto contentPolicyType = mLoadInfo->GetExternalContentPolicyType();
+    if (contentType.Equals(APPLICATION_HTTP_INDEX_FORMAT) &&
+        contentPolicyType != nsIContentPolicy::TYPE_DOCUMENT &&
+        contentPolicyType != nsIContentPolicy::TYPE_FETCH) {
+      return NS_ERROR_CORRUPTED_CONTENT;
+    }
+    if (contentPolicyType == nsIContentPolicy::TYPE_STYLESHEET &&
+        !contentType.EqualsLiteral(TEXT_CSS)) {
+      return NS_ERROR_CORRUPTED_CONTENT;
+    }
+    if (contentPolicyType == nsIContentPolicy::TYPE_SCRIPT &&
+        !nsContentUtils::IsJavascriptMIMEType(NS_ConvertUTF8toUTF16(contentType))) {
+      return NS_ERROR_CORRUPTED_CONTENT;
+    }
 
     return rv;
 }