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===================================================================
RCS file: /ftp/cvs/cvsroot/src/sys/netinet/udp_usrreq.c,v
retrieving revision 1.38
retrieving revision 1.39
diff -u -p -r1.38 -r1.39
--- src/sys/netinet/udp_usrreq.c	1996/10/16 19:33:39	1.38
+++ src/sys/netinet/udp_usrreq.c	1996/10/25 06:35:16	1.39
@@ -1,4 +1,4 @@
-/*	$NetBSD: udp_usrreq.c,v 1.38 1996/10/16 19:33:39 ws Exp $	*/
+/*	$NetBSD: udp_usrreq.c,v 1.39 1996/10/25 06:35:16 thorpej Exp $	*/
 
 /*
  * Copyright (c) 1982, 1986, 1988, 1990, 1993
@@ -450,6 +450,15 @@ udp_output(m, va_alist)
 	}
 
 	/*
+	 * Compute the packet length of the IP header, and
+	 * punt if the length looks bogus.
+	 */
+	if ((len + sizeof(struct udpiphdr)) > IP_MAXPACKET) {
+		error = EMSGSIZE;
+		goto release;
+	}
+
+	/*
 	 * Fill in mbuf with extended UDP header
 	 * and addresses and length put into network format.
 	 */