static int asf_read_unknown(AVFormatContext *s, const GUIDParseTable *g)
{
    ASFContext *asf = s->priv_data;
    AVIOContext *pb = s->pb;
    uint64_t size   = avio_rl64(pb);
    int ret;

    if (size > INT64_MAX)
        return AVERROR_INVALIDDATA;

    if (asf->is_header)
        asf->unknown_size = size;
    asf->is_header = 0;
    if (!g->is_subobject) {
        if (!(ret = strcmp(g->name, "Header Extension")))
            avio_skip(pb, 22); // skip reserved fields and Data Size
        if ((ret = detect_unknown_subobject(s, asf->unknown_offset,
                                            asf->unknown_size)) < 0)
            return ret;
    } else {
        if (size < 24) {
            av_log(s, AV_LOG_ERROR, "Too small size %"PRIu64" (< 24).\n", size);
            return AVERROR_INVALIDDATA;
        }
        avio_skip(pb, size - 24);
    }

    return 0;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.