From: Donald Sharp <sharpd@nvidia.com>
Date: Thu, 18 Feb 2021 11:55:29 +0000 (-0500)
Subject: bgpd: Fix crash when we don't have a nexthop
X-Git-Tag: frr-7.5.1~6^2~5
X-Git-Url: https://git.puffer.fish/?a=commitdiff_plain;h=f5d1dc55ed8c785699eccd076679a5ad8dd073ca;p=matthieu%2Ffrr.git

bgpd: Fix crash when we don't have a nexthop

Recent changes to allow bgpd to handle v6 LL slightly
differently in the nexthop tracking code has not
interacted well with the blackhole nexthop change
for peers.  Modify the code to do the right thing

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

diff --git a/bgpd/bgp_nht.c b/bgpd/bgp_nht.c
index af7302b750..2c70d01d46 100644
--- a/bgpd/bgp_nht.c
+++ b/bgpd/bgp_nht.c
@@ -838,7 +838,7 @@ static void evaluate_paths(struct bgp_nexthop_cache *bnc)
 			/*
 			 * Peering cannot occur across a blackhole nexthop
 			 */
-			if (bnc->nexthop_num == 1
+			if (bnc->nexthop_num == 1 && bnc->nexthop
 			    && bnc->nexthop->type == NEXTHOP_TYPE_BLACKHOLE) {
 				peer->last_reset = PEER_DOWN_WAITING_NHT;
 				valid_nexthops = 0;