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Code Issues Activity Actions

LibThreading: Register BackgroundAction with EventLoop

Browse source 
BackgroundActions are now added as a job to the event loop, therefore
they get canceled when the loop exits and their on_complete action never
runs. This fixes all UAF bugs related to BackgroundAction's use of
EventLoops, as seen with e.g. thumbnail generation.
This commit is contained in:
kleines Filmröllchen 2022-12-29 14:57:00 +01:00 • committed by Linus Groh
parent 8f4d0d3797
commit cf1fa419ab
4 changed files with 72 additions and 39 deletions
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15
Userland/Applications/DisplaySettings/MonitorWidget.cpp
View file

@ -30,26 +30,25 @@ bool MonitorWidget::set_wallpaper(DeprecatedString path)
if (!is_different_to_current_wallpaper_path(path))
return false;
(void)Threading::BackgroundAction<ErrorOr<NonnullRefPtr<Gfx::Bitmap>>>::construct(
(void)Threading::BackgroundAction<NonnullRefPtr<Gfx::Bitmap>>::construct(
[path](auto&) -> ErrorOr<NonnullRefPtr<Gfx::Bitmap>> {
if (path.is_empty())
return Error::from_errno(ENOENT);
return Gfx::Bitmap::load_from_file(path);
},
[this, path](ErrorOr<NonnullRefPtr<Gfx::Bitmap>> bitmap_or_error) -> ErrorOr<void> {
[this, path](NonnullRefPtr<Gfx::Bitmap> bitmap) -> ErrorOr<void> {
// If we've been requested to change while we were loading the bitmap, don't bother spending the cost to
// move and render the now stale bitmap.
if (is_different_to_current_wallpaper_path(path))
return {};
if (bitmap_or_error.is_error())
m_wallpaper_bitmap = nullptr;
else
m_wallpaper_bitmap = bitmap_or_error.release_value();
m_wallpaper_bitmap = move(bitmap);
m_desktop_dirty = true;
update();
return bitmap_or_error.is_error() ? bitmap_or_error.release_error() : ErrorOr<void> {};
return {};
},
[this, path](Error) -> void {
m_wallpaper_bitmap = nullptr;
});
if (path.is_empty())