static LayeredAVStream *add_av_stream1(FFServerStream *stream,
                                AVCodecContext *codec, int copy)
{
    LayeredAVStream *fst;

    if(stream->nb_streams >= FF_ARRAY_ELEMS(stream->streams))
        return NULL;

    fst = av_mallocz(sizeof(*fst));
    if (!fst)
        return NULL;
    if (copy) {
        fst->codec = avcodec_alloc_context3(codec->codec);
        if (!fst->codec) {
            av_free(fst);
            return NULL;
        }
        avcodec_copy_context(fst->codec, codec);
    } else
        /* live streams must use the actual feed's codec since it may be
         * updated later to carry extradata needed by them.
         */
        fst->codec = codec;

    fst->codecpar = avcodec_parameters_alloc();
    fst->index = stream->nb_streams;
    fst->time_base = codec->time_base;
    fst->pts_wrap_bits = 33;
    fst->sample_aspect_ratio = codec->sample_aspect_ratio;
    stream->streams[stream->nb_streams++] = fst;
    return fst;
}

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.