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 0105ceb..e09648a 100644 (file)
--- 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);