Bug 1706169 [wpt PR 28586] - [ReadableByteStream] Handle enqueuing when detach, a=testonly

Automatic update from web-platform-tests
[ReadableByteStream] Handle enqueuing when detach

Attempting to call enqueue() on a ReadableByteStreamController after
controller.byobRequest.view.buffer had been detached would crash with a
null pointer dereference.

Make it throw an exception instead.

BUG=1200302

Change-Id: I86b1511ef154a42ca78271618e00d8e1c5e6ae5d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2836768
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#874225}

--

wpt-commits: 5233fe69580d5d5d10e46869958093ea771a743f
wpt-pr: 28586

testing/web-platform/tests/streams/readable-byte-streams/enqueue-with-detached-buffer.window.js

@@ -0,0 +1,21 @@
+promise_test(async t => {
+  const error = new Error('cannot proceed');
+  const rs = new ReadableStream({
+    type: 'bytes',
+    pull(controller) {
+      t.step(() => {
+        const buffer = controller.byobRequest.view.buffer;
+        // Detach the buffer.
+        postMessage(buffer, '*', [buffer]);
+
+        // Try to enqueue with a new buffer.
+        assert_throws_js(TypeError, () => controller.enqueue(new Uint8Array([42])));
+
+        // If we got here the test passed.
+        controller.error(error);
+      });
+    }
+  });
+  const reader = rs.getReader({ mode: 'byob' });
+  await promise_rejects_exactly(t, error, reader.read(new Uint8Array(1)));
+}, 'enqueue after detaching byobRequest.view.buffer should throw');