Bug 1583251 - P4 - Allow deserialize shared memory for Workers; r=nik…

…a,perry Differential Revision: https://phabricator.services.mozilla.com/D48560
mozilla-spidermonkey · Oct 17, 2019 · 79a49ec · 79a49ec
1 parent 527509d
commit 79a49ec
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/dom/workers/MessageEventRunnable.cpp b/dom/workers/MessageEventRunnable.cpp
@@ -61,7 +61,12 @@ bool MessageEventRunnable::DispatchDOMEvent(JSContext* aCx,
         MarkerTracingType::START);
   }
 
-  Read(parent, aCx, &messageData, rv);
+  JS::CloneDataPolicy cloneDataPolicy;
+  // The target of a worker postMessage cannot change while the message is
+  // in-flight, so SAB status was checked at sending-time, and does not need to
+  // be checked when deserializing.
+  cloneDataPolicy.allowSharedMemory();
+  Read(parent, aCx, &messageData, cloneDataPolicy, rv);
 
   if (isTimelineRecording) {
     end = MakeUnique<WorkerTimelineMarker>(