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Ladybird+LibWeb+WebContent: Prevent out-of-bounds seeking audio elements

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It's currently possible to seek to the total sample count of an audio
loader. We must limit seeking to one less than that count.

This mistake was duplicated in both AudioCodecPluginSerenity/Ladybird,
so the computation was moved to a helper in the base AudioCodecPlugin.
This commit is contained in:
Timothy Flynn 2023-06-21 19:37:10 -04:00 • committed by Andreas Kling
parent 20edbb70f8
commit bcd222cfae
4 changed files with 17 additions and 16 deletions
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12
Userland/Libraries/LibWeb/Platform/AudioCodecPlugin.cpp
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@ -40,6 +40,18 @@ ErrorOr<FixedArray<Audio::Sample>> AudioCodecPlugin::read_samples_from_loader(Au
return FixedArray<Audio::Sample>::create(resampler.resample(buffer_or_error.release_value()).span());
}
Duration AudioCodecPlugin::set_loader_position(Audio::Loader& loader, double position, Duration duration, size_t device_sample_rate)
{
if (loader.total_samples() == 0)
return current_loader_position(loader, device_sample_rate);
auto duration_value = static_cast<double>(duration.to_milliseconds()) / 1000.0;
position = position / duration_value * static_cast<double>(loader.total_samples() - 1);
loader.seek(static_cast<int>(position)).release_value_but_fixme_should_propagate_errors();
return current_loader_position(loader, device_sample_rate);
}
Duration AudioCodecPlugin::current_loader_position(Audio::Loader const& loader, size_t device_sample_rate)
{
auto samples_played = static_cast<double>(loader.loaded_samples());