gstreamer1-plugins-good: gstreamer: out-of-bounds read in avidemux vprp video field descriptor parsing

A flaw was found in GStreamer gst-plugins-good avidemux. In gstavidemuxriffparsevprp, the number of available gstriffvprpvideofielddesc entries is calculated by dividing the remaining buffer size by the attacker-controlled vprp-fields value, rather than by sizeofgstriffvprpvideofielddesc. This ca...