qtdemux_tag_add_tmpo (GstQTDemux * qtdemux, const char *tag1, const char *dummy,
    GNode * node)
{
  GNode *data;
  int len;
  int type;
  int n1;

  data = qtdemux_tree_get_child_by_type (node, FOURCC_data);
  if (data) {
    len = QT_UINT32 (data->data);
    type = QT_UINT32 ((guint8 *) data->data + 8);
    GST_DEBUG_OBJECT (qtdemux, "have tempo tag, type=%d,len=%d", type, len);
    /* some files wrongly have a type 0x0f=15, but it should be 0x15 */
    if ((type == 0x00000015 || type == 0x0000000f) && len >= 18) {
      n1 = QT_UINT16 ((guint8 *) data->data + 16);
      if (n1) {
        /* do not add bpm=0 */
        GST_DEBUG_OBJECT (qtdemux, "adding tag %d", n1);
        gst_tag_list_add (qtdemux->tag_list, GST_TAG_MERGE_REPLACE,
            tag1, (gdouble) n1, NULL);
      }
    }
  }
}

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.