fix [#35507] BMesh module: Crash on to_mesh() if faces.layers.tex is used but no loops.layers.uv

2 files changed, 9 insertions, 0 deletions

diff --git a/source/blender/python/bmesh/bmesh_py_api.c b/source/blender/python/bmesh/bmesh_py_api.c
index 99fd3429973..c7b10d0aa4b 100644
--- a/source/blender/python/bmesh/bmesh_py_api.c
+++ b/source/blender/python/bmesh/bmesh_py_api.c
@@ -138,6 +138,12 @@ static PyObject *bpy_bm_update_edit_mesh(PyObject *UNUSED(self), PyObject *args,
 
 	{
 		extern void EDBM_update_generic(BMEditMesh *em, const bool do_tessface, const bool is_destructive);
+		BMEditMesh *em = me->edit_btmesh;
+		BMesh *bm = em->bm;
+
+		/* python won't ensure matching uv/mtex */
+		BM_mesh_cd_validate(bm);
+
 		EDBM_update_generic(me->edit_btmesh, do_tessface, is_destructive);
 	}
 
diff --git a/source/blender/python/bmesh/bmesh_py_types.c b/source/blender/python/bmesh/bmesh_py_types.c
index 6ea8d6c68ce..0db8b07d5f5 100644
--- a/source/blender/python/bmesh/bmesh_py_types.c
+++ b/source/blender/python/bmesh/bmesh_py_types.c
@@ -907,6 +907,9 @@ static PyObject *bpy_bmesh_to_mesh(BPy_BMesh *self, PyObject *args)
 
 	bm = self->bm;
 
+	/* python won't ensure matching uv/mtex */
+	BM_mesh_cd_validate(bm);
+
 	BM_mesh_bm_to_me(bm, me, false);
 
 	/* we could have the user do this but if they forget blender can easy crash