OSV-2021-1797 Heap-buffer-overflow in grk::GrkImage::cieLabToRGB

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=43161 Crash type: Heap-buffer-overflow WRITE 4 Crash state: grk::GrkImage::cieLabToRGB grk::GrkImage::applyColourManagement grk::CodeStreamDecompress::postProcess...