[Bf-blender-cvs] [6de33ee656e] blender-v2.90-release: Fix T80238: Crash adding properties to material node-trees

[Campbell Barton]

Commit: 6de33ee656e69bddcab1d3dfc85fd3ccbf033abb
Author: Campbell Barton
Date:   Tue Sep 8 18:04:03 2020 +1000
Branches: blender-v2.90-release
https://developer.blender.org/rB6de33ee656e69bddcab1d3dfc85fd3ccbf033abb

Fix T80238: Crash adding properties to material node-trees

The localized node-tree was freeing the materials ID properties twice.

This matches how animation data behaves, setting to NULL after freeing.

===================================================================

M	source/blender/blenkernel/intern/lib_id_delete.c

===================================================================

diff --git a/source/blender/blenkernel/intern/lib_id_delete.c b/source/blender/blenkernel/intern/lib_id_delete.c
index 561db7d62c2..22ea5f2c854 100644
--- a/source/blender/blenkernel/intern/lib_id_delete.c
+++ b/source/blender/blenkernel/intern/lib_id_delete.c
@@ -56,10 +56,12 @@ void BKE_libblock_free_data(ID *id, const bool do_id_user)
   if (id->properties) {
     IDP_FreePropertyContent_ex(id->properties, do_id_user);
     MEM_freeN(id->properties);
+    id->properties = NULL;
   }
 
   if (id->override_library) {
     BKE_lib_override_library_free(&id->override_library, do_id_user);
+    id->override_library = NULL;
   }
 
   BKE_animdata_free(id, do_id_user);