OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=369652657
Crash type: Use-of-uninitialized-value
Crash state:
ultrahdr::uhdr_gainmap_metadata_frac::encodeGainmapMetadata
ultrahdr::JpegR::appendGainMap
ultrahdr::JpegR::encodeJPEGR