buffer: avoid creating the backing store in the thread

Fixes: #37030 PR-URL: #37052 Backport-PR-URL: #39704 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Antoine du Hamel <[email protected]> Reviewed-By: Rich Trott <[email protected]>
nodejs · Aug 31, 2021 · 8484ab2 · 8484ab2
1 parent bad990c
commit 8484ab2
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/node_blob.cc b/src/node_blob.cc
@@ -253,8 +253,6 @@ void FixedSizeBlobCopyJob::AfterThreadPoolWork(int status) {
 }
 
 void FixedSizeBlobCopyJob::DoThreadPoolWork() {
-  Environment* env = AsyncWrap::env();
-  destination_ = ArrayBuffer::NewBackingStore(env->isolate(), length_);
   unsigned char* dest = static_cast<unsigned char*>(destination_->Data());
   if (length_ > 0) {
     size_t total = 0;
@@ -313,6 +311,8 @@ void FixedSizeBlobCopyJob::Run(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
   FixedSizeBlobCopyJob* job;
   ASSIGN_OR_RETURN_UNWRAP(&job, args.Holder());
+  job->destination_ =
+      ArrayBuffer::NewBackingStore(env->isolate(), job->length_);
   if (job->mode() == FixedSizeBlobCopyJob::Mode::ASYNC)
     return job->ScheduleWork();