Bug 1482452 - p2: validate object before sending to Java runtime. r=snorp

Depends on D16707

Differential Revision: https://phabricator.services.mozilla.com/D16708

--HG--
extra : moz-landing-system : lando

dom/media/platforms/android/RemoteDataDecoder.cpp

@@ -133,6 +133,10 @@ class RemoteVideoDecoder : public RemoteDataDecoder {
     JavaCallbacksSupport::Init();
 
     mJavaCallbacks = CodecProxy::NativeCallbacks::New();
+    if (!mJavaCallbacks) {
+      return InitPromise::CreateAndReject(NS_ERROR_DOM_MEDIA_FATAL_ERR,
+                                          __func__);
+    }
     JavaCallbacksSupport::AttachNative(
         mJavaCallbacks, mozilla::MakeUnique<CallbacksSupport>(this));
 
@@ -325,6 +329,10 @@ class RemoteAudioDecoder : public RemoteDataDecoder {
     JavaCallbacksSupport::Init();
 
     mJavaCallbacks = CodecProxy::NativeCallbacks::New();
+    if (!mJavaCallbacks) {
+      return InitPromise::CreateAndReject(NS_ERROR_DOM_MEDIA_FATAL_ERR,
+                                          __func__);
+    }
     JavaCallbacksSupport::AttachNative(
         mJavaCallbacks, mozilla::MakeUnique<CallbacksSupport>(this));