OSV-2021-1524 Heap-buffer-overflow in Canvas5Structure::NIBDecoder::decode

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=40619 Crash type: Heap-buffer-overflow READ 1 Crash state: Canvas5Structure::NIBDecoder::decode Canvas5Structure::decodeZone5 Canvas5Parser::decode...