Author: melifaro
Date: Fri Jan 15 13:47:11 2016
New Revision: 294089
URL: https://svnweb.freebsd.org/changeset/base/294089
Log:
Clean up original route path selection logic a bit.
NULL pointer dereference claimed by Coverity was possible
if one (or several) next-hops for had their weights set to 0.
CID: 1348482
Modified:
head/sys/net/radix_mpath.c
Modified: head/sys/net/radix_mpath.c
==============================================================================
--- head/sys/net/radix_mpath.c Fri Jan 15 12:09:15 2016 (r294088)
+++ head/sys/net/radix_mpath.c Fri Jan 15 13:47:11 2016 (r294089)
@@ -201,19 +201,20 @@ static struct rtentry *
rt_mpath_selectrte(struct rtentry *rte, uint32_t hash)
{
struct radix_node *rn0, *rn;
- u_int32_t n;
+ uint32_t total_weight;
struct rtentry *rt;
int64_t weight;
/* beyond here, we use rn as the master copy */
rn0 = rn = (struct radix_node *)rte;
- n = rn_mpath_count(rn0);
+ rt = rte;
/* gw selection by Modulo-N Hash (RFC2991) XXX need improvement? */
+ total_weight = rn_mpath_count(rn0);
hash += hashjitter;
- hash %= n;
- for (weight = abs((int32_t)hash), rt = rte;
- weight >= rt->rt_weight && rn;
+ hash %= total_weight;
+ for (weight = abs((int32_t)hash);
+ rt != NULL && weight >= rt->rt_weight;
weight -= rt->rt_weight) {
/* stay within the multipath routes */
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