Apply by doing:
	cd /usr/src/usr.bin/ssh
	patch -p0 < 021_openssh.patch

Rebuild and install ssh:
	make cleandir
	make obj
	make depend
	make && make install

Restart sshd:
	kill -HUP `cat /var/run/sshd.pid`

Index: channels.c
===================================================================
RCS file: /cvs/src/usr.bin/ssh/channels.c,v
retrieving revision 1.109
diff -u -r1.109 channels.c
--- channels.c	17 Apr 2001 12:55:03 -0000	1.109
+++ channels.c	8 Mar 2002 19:48:26 -0000
@@ -150,7 +150,7 @@
 channel_lookup(int id)
 {
 	Channel *c;
-	if (id < 0 || id > channels_alloc) {
+	if (id < 0 || id >= channels_alloc) {
 		log("channel_lookup: %d: bad id", id);
 		return NULL;
 	}