[DOM] Drop mWrappedRunnable early in workers.

This should prevent some intermittent crashes.

1 files changed, 2 insertions, 0 deletions

diff --git a/dom/workers/WorkerPrivate.cpp b/dom/workers/WorkerPrivate.cpp
index 51ab67f708..98f153ea89 100644
--- a/dom/workers/WorkerPrivate.cpp
+++ b/dom/workers/WorkerPrivate.cpp
@@ -241,6 +241,7 @@ private:
   WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
   {
     nsresult rv = mWrappedRunnable->Run();
+    mWrappedRunnable = nullptr;
     if (NS_FAILED(rv)) {
       if (!JS_IsExceptionPending(aCx)) {
         Throw(aCx, rv);
@@ -259,6 +260,7 @@ private:
     MOZ_ASSERT(cancelable); // We checked this earlier!
     rv = cancelable->Cancel();
     nsresult rv2 = WorkerRunnable::Cancel();
+    mWrappedRunnable = nullptr;
     return NS_FAILED(rv) ? rv : rv2;
   }
 };