OSV-2021-460 Heap-buffer-overflow in Op_to_sdr_planes::convert_colorspace

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=31495 Crash type: Heap-buffer-overflow READ 2 Crash state: Optosdrplanes::convertcolorspace heif::ColorConversionPipeline::convertimage heif::convertcolorspace...