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

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Date:   Sat, 30 May 2020 12:07:32 -0700
From:   Roopa Prabhu <roopa@...ulusnetworks.com>
To:     Ido Schimmel <idosch@...sch.org>
Cc:     David Miller <davem@...emloft.net>, kuba@...nel.org,
        netdev <netdev@...r.kernel.org>, David Ahern <dsahern@...il.com>,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        Petr Machata <petrm@...lanox.com>
Subject: Re: [PATCH net-next 0/2] vxlan fdb nexthop misc fixes

On Sat, May 30, 2020 at 6:34 AM Ido Schimmel <idosch@...sch.org> wrote:
>
> 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?
>

Thanks Ido. This makes sense. I will add it to v2.