From: mpf <mpf@openbsd.org>
Date: Wed, 30 Jul 2008 10:15:35 +0000 (+0000)
Subject: Prevent a divide by zero panic if trunkproto loadbalance is
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=9368cb083dfef01a6e4faad390becc38019ff235;p=openbsd

Prevent a divide by zero panic if trunkproto loadbalance is
used w/out any trunkports. Patch from Dmitri Alenitchev.
OK reyk@
---

diff --git a/sys/net/if_trunk.c b/sys/net/if_trunk.c
index 0105cebdabc..e09648a8b58 100644
--- a/sys/net/if_trunk.c
+++ b/sys/net/if_trunk.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_trunk.c,v 1.46 2008/06/15 06:56:09 mpf Exp $	*/
+/*	$OpenBSD: if_trunk.c,v 1.47 2008/07/30 10:15:35 mpf Exp $	*/
 
 /*
  * Copyright (c) 2005, 2006, 2007 Reyk Floeter <reyk@openbsd.org>
@@ -1461,6 +1461,11 @@ trunk_lb_start(struct trunk_softc *tr, struct mbuf *m)
 	u_int32_t p = 0;
 	int idx;
 
+	if (tr->tr_count == 0) {
+		m_freem(m);
+		return (EINVAL);
+	}
+
 	p = trunk_hashmbuf(m, lb->lb_key);
 	if ((idx = p % tr->tr_count) >= TRUNK_MAX_PORTS) {
 		m_freem(m);