Fix T60304, T60301: setting error message in bevel modifier results in double free

source/blender/modifiers/intern/MOD_bevel.c

@@ -74,12 +74,13 @@ static void initData(ModifierData *md)
 	bmd->clnordata.faceHash = NULL;
 }
 
-static void copyData(const ModifierData *md_src, ModifierData *md_dst, const int UNUSED(flag))
+static void copyData(const ModifierData *md_src, ModifierData *md_dst, const int flag)
 {
 	BevelModifierData *bmd_src = (BevelModifierData *)md_src;
 	BevelModifierData *bmd_dst = (BevelModifierData *)md_dst;
 
-	*bmd_dst = *bmd_src;
+	modifier_copyData_generic(md_src, md_dst, flag);
+
 	bmd_dst->clnordata.faceHash = NULL;
 }
 
@@ -99,6 +100,8 @@ static CustomDataMask requiredDataMask(Object *UNUSED(ob), ModifierData *md)
  */
 static Mesh *applyModifier(ModifierData *md, const ModifierEvalContext *ctx, Mesh *mesh)
 {
+	// modifier_setError(md, "Hello world");
+	// return BKE_mesh_new_nomain(0, 0, 0, 0, 0);
 	Mesh *result;
 	BMesh *bm;
 	BMIter iter;