Bug 604026 - Sync event loops in workers should be created only if compatible with the worker shutdown status

1 files changed, 9 insertions, 1 deletions

diff --git a/dom/workers/WorkerPrivate.cpp b/dom/workers/WorkerPrivate.cpp
index 8848e881a..612090027 100644
--- a/dom/workers/WorkerPrivate.cpp
+++ b/dom/workers/WorkerPrivate.cpp
@@ -5446,10 +5446,18 @@ WorkerPrivate::CancelAllTimeouts()
 }
 
 already_AddRefed<nsIEventTarget>
-WorkerPrivate::CreateNewSyncLoop()
+WorkerPrivate::CreateNewSyncLoop(Status aFailStatus)
 {
   AssertIsOnWorkerThread();
 
+  {
+    MutexAutoLock lock(mMutex);
+
+    if (mStatus >= aFailStatus) {
+      return nullptr;
+    }
+  }
+
   nsCOMPtr<nsIThreadInternal> thread = do_QueryInterface(NS_GetCurrentThread());
   MOZ_ASSERT(thread);