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fix: ReadableStream::get_in_memory_bytes too large (#36914)

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Fix a IPC hang due to `ReadableStream::get_in_memory_bytes` could return
really huge chunk.

Testing: WPT on ReadableStream should pass
Fixes: IPC hang when transferring huge chunk bytes from `ReadableStream`


cc @gterzian @Taym95 since this is also related to ReadableStream.

---------

Signed-off-by: Yu Wei Wu <yuweiwu@YunoMacBook-Air.local>
Co-authored-by: Yu Wei Wu <yuweiwu@YunoMacBook-Air.local>
This commit is contained in:
Ngo Iok Ui (Wu Yu Wei) 2025-05-13 01:00:14 +09:00 • committed by GitHub
parent c37d5572fd
commit aa4ad0f2be
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5 changed files with 29 additions and 20 deletions
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7
components/script/dom/readablestream.rs
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@ -11,6 +11,7 @@ use std::rc::Rc;
use base::id::{MessagePortId, MessagePortIndex};
use constellation_traits::MessagePortImpl;
use dom_struct::dom_struct;
use ipc_channel::ipc::IpcSharedMemory;
use js::conversions::ToJSValConvertible;
use js::jsapi::{Heap, JSObject};
use js::jsval::{JSVal, NullValue, ObjectValue, UndefinedValue};
@ -1131,12 +1132,14 @@ impl ReadableStream {
/// Return bytes for synchronous use, if the stream has all data in memory.
/// Useful for native source integration only.
pub(crate) fn get_in_memory_bytes(&self) -> Option<Vec<u8>> {
pub(crate) fn get_in_memory_bytes(&self) -> Option<IpcSharedMemory> {
match self.controller.borrow().as_ref() {
Some(ControllerType::Default(controller)) => controller
.get()
.expect("Stream should have controller.")
.get_in_memory_bytes(),
.get_in_memory_bytes()
.as_deref()
.map(IpcSharedMemory::from_bytes),
_ => {
unreachable!("Getting in-memory bytes for a stream with a non-default controller")
},