qtdemux_parse_theora_extension (GstQTDemux * qtdemux, QtDemuxStream * stream,
    GNode * xdxt)
{
  int len = QT_UINT32 (xdxt->data);
  guint8 *buf = xdxt->data;
  guint8 *end = buf + len;
  GstBuffer *buffer;

  /* skip size and type */
  buf += 8;
  end -= 8;

  while (buf < end) {
    gint size;
    guint32 type;

    size = QT_UINT32 (buf);
    type = QT_FOURCC (buf + 4);

    GST_LOG_OBJECT (qtdemux, "%p %p", buf, end);

    if (buf + size > end || size <= 0)
      break;

    buf += 8;
    size -= 8;

    GST_WARNING_OBJECT (qtdemux, "have cookie %" GST_FOURCC_FORMAT,
        GST_FOURCC_ARGS (type));

    switch (type) {
      case FOURCC_tCtH:
        buffer = gst_buffer_new_and_alloc (size);
        memcpy (GST_BUFFER_DATA (buffer), buf, size);
        stream->buffers = g_slist_append (stream->buffers, buffer);
        GST_LOG_OBJECT (qtdemux, "parsing theora header");
        break;
      case FOURCC_tCt_:
        buffer = gst_buffer_new_and_alloc (size);
        memcpy (GST_BUFFER_DATA (buffer), buf, size);
        stream->buffers = g_slist_append (stream->buffers, buffer);
        GST_LOG_OBJECT (qtdemux, "parsing theora comment");
        break;
      case FOURCC_tCtC:
        buffer = gst_buffer_new_and_alloc (size);
        memcpy (GST_BUFFER_DATA (buffer), buf, size);
        stream->buffers = g_slist_append (stream->buffers, buffer);
        GST_LOG_OBJECT (qtdemux, "parsing theora codebook");
        break;
      default:
        GST_WARNING_OBJECT (qtdemux,
            "unknown theora cookie %" GST_FOURCC_FORMAT,
            GST_FOURCC_ARGS (type));
        break;
    }
    buf += size;
  }
  return TRUE;
}

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.