core: object: add nullptr checks to data retrieval functions

core/object.c

@@ -92,6 +92,10 @@ bool b_object_is_type(const struct _b_object *p, b_type type)
 
 void *b_object_get_private(const struct _b_object *object, b_type type)
 {
+	if (!object) {
+		return NULL;
+	}
+
 	if (b_type_id_compare(&object->obj_type->r_info->t_id, type) == 0) {
 		return (char *)object + object->obj_main_priv_offset;
 	}
@@ -107,6 +111,10 @@ void *b_object_get_private(const struct _b_object *object, b_type type)
 
 void *b_object_get_protected(const struct _b_object *object, b_type type)
 {
+	if (!object) {
+		return NULL;
+	}
+
 	struct b_type_component *comp
 		= b_type_get_component(&object->obj_type->r_components, type);
 	if (!comp) {
@@ -118,6 +126,10 @@ void *b_object_get_protected(const struct _b_object *object, b_type type)
 
 void *b_object_get_interface(const struct _b_object *object, b_type type)
 {
+	if (!object) {
+		return NULL;
+	}
+
 	return b_class_get_interface(object->obj_type->r_class, type);
 }
 
@@ -125,6 +137,10 @@ enum b_status b_object_get_data(
 	const struct _b_object *object, b_type type, void **priv, void **prot,
 	void **iface)
 {
+	if (!object) {
+		return B_ERR_INVALID_ARGUMENT;
+	}
+
 	struct b_type_component *comp
 		= b_type_get_component(&object->obj_type->r_components, type);
 	if (!comp) {