static int mov_read_hdlr(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
    AVStream *st;
    uint32_t type;
    uint32_t av_unused ctype;
    int title_size;
    char *title_str;

    if (c->fc->nb_streams < 1) // meta before first trak
        return 0;

    st = c->fc->streams[c->fc->nb_streams-1];

    avio_r8(pb); /* version */
    avio_rb24(pb); /* flags */

    /* component type */
    ctype = avio_rl32(pb);
    type = avio_rl32(pb); /* component subtype */

    av_dlog(c->fc, "ctype= %.4s (0x%08x)\n", (char*)&ctype, ctype);
    av_dlog(c->fc, "stype= %.4s\n", (char*)&type);

    if     (type == MKTAG('v','i','d','e'))
        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
    else if (type == MKTAG('s','o','u','n'))
        st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
    else if (type == MKTAG('m','1','a',' '))
        st->codec->codec_id = CODEC_ID_MP2;
    else if ((type == MKTAG('s','u','b','p')) || (type == MKTAG('c','l','c','p')))
        st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;

    avio_rb32(pb); /* component  manufacture */
    avio_rb32(pb); /* component flags */
    avio_rb32(pb); /* component flags mask */

    title_size = atom.size - 24;
    if (title_size > 0) {
        title_str = av_malloc(title_size + 1); /* Add null terminator */
        if (!title_str)
            return AVERROR(ENOMEM);
        avio_read(pb, title_str, title_size);
        title_str[title_size] = 0;
        if (title_str[0])
            av_dict_set(&st->metadata, "handler_name", title_str +
                        (!c->isom && title_str[0] == title_size - 1), 0);
        av_freep(&title_str);
    }

    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.