static int detect_unknown_subobject(AVFormatContext *s, int64_t offset, int64_t size)
{
    ASFContext *asf = s->priv_data;
    AVIOContext *pb = s->pb;
    const GUIDParseTable *g = NULL;
    ff_asf_guid guid;
    int ret;

    while (avio_tell(pb) <= offset + size) {
        if (avio_tell(pb) == asf->offset)
            break;
        asf->offset = avio_tell(pb);
        if ((ret = ff_get_guid(pb, &guid)) < 0)
            return ret;
        g = find_guid(guid);
        if (g) {
            if ((ret = g->read_object(s, g)) < 0)
                return ret;
        } else {
            GUIDParseTable g2;

            g2.name         = "Unknown";
            g2.is_subobject = 1;
            asf_read_unknown(s, &g2);
        }
    }

    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.