net: mpls: Update lfib_nlmsg_size to skip deleted nexthops

A recent commit skips nexthops in a route if the device has been
deleted. Update lfib_nlmsg_size accordingly.

Reported-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Acked-by: Robert Shearman <rshearma@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index 673f3d990b5c..06ffafde70da 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -1880,6 +1880,8 @@ static inline size_t lfib_nlmsg_size(struct mpls_route *rt)
                 size_t nhsize = 0;
 
                 for_nexthops(rt) {
+                        if (!rtnl_dereference(nh->nh_dev))
+                                continue;
                         nhsize += nla_total_size(sizeof(struct rtnexthop));
                         /* RTA_VIA */
                         if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC)