Fix T65638: memory leak - modifiers on curves.

We need to tag the `mesh_eval` of curve as owned, when we generate one,
otherwise freeing code would not free it.

1 files changed, 9 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/displist.c b/source/blender/blenkernel/intern/displist.c
index b67335235a4..cf6f1fdeec1 100644
--- a/source/blender/blenkernel/intern/displist.c
+++ b/source/blender/blenkernel/intern/displist.c
@@ -1159,6 +1159,10 @@ static void curve_calc_modifiers_post(Depsgraph *depsgraph,
       (*r_final) = NULL;
     }
   }
+  else if (modified != NULL) {
+    /* Prety stupid to generate that whole mesh if it's unused, yet we have to free it. */
+    BKE_id_free(NULL, modified);
+  }
 }
 
 static void displist_surf_indices(DispList *dl)
@@ -1808,6 +1812,11 @@ void BKE_displist_make_curveTypes(
   do_makeDispListCurveTypes(
       depsgraph, scene, ob, dispbase, for_render, for_orco, &ob->runtime.mesh_eval);
 
+  if (ob->runtime.mesh_eval != NULL) {
+    ob->runtime.mesh_eval->id.tag |= LIB_TAG_COPIED_ON_WRITE_EVAL_RESULT;
+    ob->runtime.is_mesh_eval_owned = true;
+  }
+
   boundbox_displist_object(ob);
 }