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LibWeb: Keep message alive in postMessage task callback lambda

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Tasks can run at any time in the future and GC can run in the time
between postMessage and running the task, meaning the message can be
reaped if we don't keep a handle to it.

Fixes Google Syndication ads crashing 100% of the time on rpcs3.net
This commit is contained in:
Luke Wilde
2022-09-23 16:17:39 +01:00
committed by Linus Groh
parent f46cc90f82
commit dfe57543a4
2 changed files with 4 additions and 4 deletions
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4
Userland/Libraries/LibWeb/HTML/MessagePort.cpp
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@@ -87,9 +87,9 @@ void MessagePort::post_message(JS::Value message)
// FIXME: This is an ad-hoc hack implementation instead, since we don't currently
// have serialization and deserialization of messages.
main_thread_event_loop().task_queue().add(HTML::Task::create(HTML::Task::Source::PostedMessage, nullptr, [strong_port = JS::make_handle(*target_port), message]() mutable {
main_thread_event_loop().task_queue().add(HTML::Task::create(HTML::Task::Source::PostedMessage, nullptr, [strong_port = JS::make_handle(*target_port), strong_message = JS::make_handle(message)]() mutable {
MessageEventInit event_init {};
event_init.data = message;
event_init.data = strong_message.value();
event_init.origin = "<origin>";
strong_port->dispatch_event(*MessageEvent::create(verify_cast<HTML::Window>(strong_port->realm().global_object()), HTML::EventNames::message, event_init));
}));