netdev - [PATCH net-next] vxlan: fix dereference of nexthop group in nexthop update path

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Date:   Sat, 30 May 2020 22:17:20 -0700
From:   Roopa Prabhu <roopa@...ulusnetworks.com>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, dsahern@...il.com,
        nikolay@...ulusnetworks.com, jiri@...lanox.com,
        idosch@...lanox.com, petrm@...lanox.com
Subject: [PATCH net-next] vxlan: fix dereference of nexthop group in nexthop update path

From: Roopa Prabhu <roopa@...ulusnetworks.com>

fix dereference of nexthop group in fdb nexthop group
update validation path.

Fixes: 1274e1cc4226 ("vxlan: ecmp support for mac fdb entries")
Reported-by: Ido Schimmel <idosch@...sch.org>
Suggested-by: Ido Schimmel <idosch@...sch.org>
Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
---
 drivers/net/vxlan.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 39bc10a..ea7af03 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -881,13 +881,13 @@ static int vxlan_fdb_nh_update(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
 			goto err_inval;
 		}
 
-		if (!nh->is_group || !nh->nh_grp->mpath) {
+		nhg = rtnl_dereference(nh->nh_grp);
+		if (!nh->is_group || !nhg->mpath) {
 			NL_SET_ERR_MSG(extack, "Nexthop is not a multipath group");
 			goto err_inval;
 		}
 
 		/* check nexthop group family */
-		nhg = rtnl_dereference(nh->nh_grp);
 		switch (vxlan->default_dst.remote_ip.sa.sa_family) {
 		case AF_INET:
 			if (!nhg->has_v4) {
-- 
2.1.4