(undescribed patch)

diff -puN arch/um/drivers/slip_user.c~uml-uml_net-security-fix arch/um/drivers/slip_user.c
@@ -108,6 +108,9 @@ static int slip_tramp(char **argv, int f
 			err = -EINVAL;
 		}
 	}
+
+	os_close_file(fds[0]);
+
 	return(err);
 }
 

@@ -128,6 +131,7 @@ static int slip_open(void *data)
 	sfd = os_open_file(ptsname(mfd), of_rdwr(OPENFLAGS()), 0);
 	if(sfd < 0){
 		printk("Couldn't open tty for slip line, err = %d\n", -sfd);
+		os_close_file(mfd);
 		return(sfd);
 	}
 	if(set_up_tty(sfd)) return(-1);

@@ -175,7 +179,7 @@ static void slip_close(int fd, void *dat
 
 	sprintf(version_buf, "%d", UML_NET_VERSION);
 
-	err = slip_tramp(argv, -1);
+	err = slip_tramp(argv, pri->slave);
 
 	if(err != 0)
 		printk("slip_tramp failed - errno = %d\n", -err);