libceph: weaken sizeof check in ceph_x_verify_authorizer_reply()

Allow for extending ceph_x_authorize_reply in the future.

Signed-off-by: Ilya Dryomov <[e-mail]>
Reviewed-by: Sage Weil <[e-mail]>

net/ceph/auth_x.c

···
 	ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN);
 	if (ret < 0)
 		return ret;
-	if (ret != sizeof(*reply))
-		return -EPERM;
+	if (ret < sizeof(*reply)) {
+		pr_err("bad size %d for ceph_x_authorize_reply\n", ret);
+		return -EINVAL;
+	}
 
 	if (au->nonce + 1 != le64_to_cpu(reply->nonce_plus_one))
 		ret = -EPERM;