zebra: The prn value may be NULL do not allow deref

The prn value as passed in may be NULL as such do not
allow it to be derefed (even though it works now).

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>

diff --git a/zebra/zebra_rnh.c b/zebra/zebra_rnh.c
index 8c866646bfd0cb7133449f22991821bea5e2fc10..ad8ffda2913fc8794037ee844426ac746cf6e632 100644 (file)
--- a/zebra/zebra_rnh.c
+++ b/zebra/zebra_rnh.c
@@ -632,7 +632,7 @@ static void zebra_rnh_eval_nexthop_entry(struct zebra_vrf *zvrf, afi_t afi,
         * the resolving route has some change (e.g., metric), there is a state
         * change.
         */
-       if (!prefix_same(&rnh->resolved_route, &prn->p)) {
+       if (!prefix_same(&rnh->resolved_route, prn ? NULL : &prn->p)) {
                if (prn)
                        prefix_copy(&rnh->resolved_route, &prn->p);
                else