stream: validate undefined sizeAlgorithm in WritableStream

PR-URL: #56067 Fixes: #56014 Refs: whatwg/streams#1333 Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Jake Yuesong Li <[email protected]>
nodejs · Jan 2, 2025 · 3a3f5c9 · 3a3f5c9
1 parent 4930244
commit 3a3f5c9
Showing 1 changed file with 10 additions and 1 deletion.
diff --git a/lib/internal/webstreams/writablestream.js b/lib/internal/webstreams/writablestream.js
@@ -1176,9 +1176,18 @@ function writableStreamDefaultControllerGetDesiredSize(controller) {
 }
 
 function writableStreamDefaultControllerGetChunkSize(controller, chunk) {
+  const {
+    stream,
+    sizeAlgorithm,
+  } = controller[kState];
+  if (sizeAlgorithm === undefined) {
+    assert(stream[kState].state === 'errored' || stream[kState].state === 'erroring');
+    return 1;
+  }
+
   try {
     return FunctionPrototypeCall(
-      controller[kState].sizeAlgorithm,
+      sizeAlgorithm,
       undefined,
       chunk);
   } catch (error) {