(add_new_tcp): check for the socket fd being too large to select on

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@9113 ec53bebd-3082-4978-b11e-865c3cabbd6b

kpasswd/kpasswdd.c

@@ -456,6 +456,8 @@ doit (krb5_keytab keytab, int port)
 	    krb5_err (context, 1, errno, "bind(%s)", str);
 	}
 	maxfd = max (maxfd, sockets[i]);
+	if (maxfd >= FD_SETSIZE)
+	    krb5_errx (context, 1, "fd too large");
 	FD_SET(sockets[i], &real_fdset);
     }