cropadd: reject 0 planes formats

modules/video_filter/croppadd.c

@@ -144,6 +144,11 @@ static int OpenFilter( vlc_object_t *p_this )
         return VLC_EGENERIC;
     }
 
+    const vlc_chroma_description_t *p_chroma =
+        vlc_fourcc_GetChromaDescription( p_filter->fmt_in.video.i_chroma );
+    if( p_chroma == NULL || p_chroma->plane_count == 0 )
+        return VLC_EGENERIC;
+
     p_filter->p_sys = (filter_sys_t *)malloc( sizeof( filter_sys_t ) );
     if( !p_filter->p_sys ) return VLC_ENOMEM;