librawspeed: Bad-cast to rawspeed::RawDecoder from invalid vptr;rawspeed::X3fDecoder::decompressSigma;rawspeed::X3fDecoder::decodeRawInternal

Project: https://github.com/darktable-org/rawspeed.git Detailed report: https://oss-fuzz.com/testcase?key=4512203543674880 Project: librawspeed Fuzzer: libFuzzerlibrawspeedX3fParserFuzzer-GetDecoder-Decode Fuzz target binary: X3fParserFuzzer-GetDecoder-Decode Job Type: libfuzzerubsanlibrawspeed...