diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 2fc352b1f8c5..22d9fcb5f7ca 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -1786,6 +1786,10 @@ int smb2_sess_setup(struct ksmbd_work *work)
 				}
 				kfree(sess->Preauth_HashValue);
 				sess->Preauth_HashValue = NULL;
+			} else {
+				pr_info_ratelimited("Unknown NTLMSSP message type : 0x%x\n",
+						le32_to_cpu(negblob->MessageType));
+				rc = -EINVAL;
 			}
 		} else {
 			/* TODO: need one more negotiation */