Check return values from seteuid, prompted by MIT advisory.

Thanks to Tom Yu at MIT, and Michael Calmer and Marcus Meissner at SUSE.
Either of CVE-2006-3083 or CVE-2006-3084.


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@17874 ec53bebd-3082-4978-b11e-865c3cabbd6b

appl/rcp/rcp.c

@@ -272,7 +272,8 @@ tolocal(int argc, char **argv)
 		}
 		free(bp);
 		sink(1, argv + argc - 1);
-		seteuid(0);
+		if (seteuid(0) < 0)
+			exit(1);
 		close(remin);
 		remin = remout = -1;
 	}