From: Roopa Prabhu <roopa@cumulusnetworks.com>
Date: Sat, 30 May 2020 22:17:20 -0700
Subject: vxlan: fix dereference of nexthop group in nexthop update path
Patch-mainline: v5.8-rc1
Git-commit: 03eaeda7806dcafb221a66939fcec9748619d16a
References: bsc#1176447
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@idosch.org>
Suggested-by: Ido Schimmel <idosch@idosch.org>
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/vxlan.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -881,13 +881,13 @@ static int vxlan_fdb_nh_update(struct vx
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) {