If a user sends a packet which is smaller than WHDRSIZE, the code 
will later hit a loop which will result in the service faulting.  
A simple DoS where the server will be taken out, but something 
that should be fixed :).

http://bugs.gentoo.org/show_bug.cgi?id=78371

--- rwhod/rwhod.c
+++ rwhod/rwhod.c
@@ -258,6 +258,10 @@
 				syslog(LOG_WARNING, "recv: %m");
 			continue;
 		}
+		if (cc < WHDRSIZE) {
+			syslog(LOG_WARNING, "packet too small");
+			continue;
+		}
 		if (from.sin_port != sp->s_port) {
 			syslog(LOG_WARNING, "%d: bad from port",
 				ntohs(from.sin_port));