netdev - Re: [PATCH net-next 0/2] vxlan fdb nexthop misc fixes

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Date:   Sat, 30 May 2020 16:34:30 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     Roopa Prabhu <roopa@...ulusnetworks.com>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        dsahern@...il.com, nikolay@...ulusnetworks.com, jiri@...lanox.com,
        idosch@...lanox.com, petrm@...lanox.com
Subject: Re: [PATCH net-next 0/2] vxlan fdb nexthop misc fixes

On Thu, May 28, 2020 at 10:12:34PM -0700, Roopa Prabhu wrote:
> From: Roopa Prabhu <roopa@...ulusnetworks.com>

Hi Roopa,

I noticed that sparse complains about the following problem in
the original submission (not handled by current set):

drivers/net/vxlan.c:884:41: warning: dereference of noderef expression

Seems to be fixed by:

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 39bc10a7fd2e..ea7af03e0957 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) {

Assuming it's correct, can you please fold it into v2?

> 
> Roopa Prabhu (2):
>   vxlan: add check to prevent use of remote ip attributes with NDA_NH_ID
>   vxlan: few locking fixes in nexthop event handler
> 
>  drivers/net/vxlan.c | 36 +++++++++++++++++++++++++++++-------
>  1 file changed, 29 insertions(+), 7 deletions(-)
> 
> -- 
> 2.1.4
>