adts_decode_extradata in libavformat/adtsenc.c in FFmpeg 4.4 does not check the init_get_bits return value, which is a necessary step because the second argument to init_get_bits can be crafted. CREATE(Triage):(User=admin) CVE-2021-38171 (https://nvd.nist.gov/vuln/detail/CVE-2021-38171)
