SQLStdHiveAccessController.showPrivileges Method may encountered Null pointer

List<HiveObjectPrivilege> msObjPrivs = mClient.list_privileges(
principalName, principalType,
this.getThriftHiveObjectRef(privObj));

>>> CID 166074: Null pointer dereferences (NULL_RETURNS)
>>> Calling a method on null object "msObjPrivs".
for (HiveObjectPrivilege msObjPriv : msObjPrivs) {
HivePrincipal resPrincipal = new HivePrincipal(
msObjPriv.getPrincipalName(),
AuthorizationUtils.getHivePrincipalType(msObjPriv
.getPrincipalType()));

Reason：
The method mClient.list_privileges(
principalName, principalType,
this.getThriftHiveObjectRef(privObj)); may return null ；