linux-kernel - RE: [PATCH] net: stmmac: fix maxmtu assignment to be within valid range

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Message-ID: <F54AEECA5E2B9541821D670476DAE19C5A9186FA@PGSMSX102.gar.corp.intel.com>
Date:   Fri, 6 Jan 2017 01:59:23 +0000
From:   "Kweh, Hock Leong" <hock.leong.kweh@...el.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
CC:     "David S. Miller" <davem@...emloft.net>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Giuseppe CAVALLARO <peppe.cavallaro@...com>,
        "seraphin.bonnaffe@...com" <seraphin.bonnaffe@...com>,
        Jarod Wilson <jarod@...hat.com>,
        Alexandre TORGUE <alexandre.torgue@...il.com>,
        "Joachim Eastwood" <manabian@...il.com>,
        Niklas Cassel <niklas.cassel@...s.com>,
        Johan Hovold <johan@...nel.org>, Pavel Machek <pavel@....cz>,
        "lars.persson@...s.com" <lars.persson@...s.com>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] net: stmmac: fix maxmtu assignment to be within valid
 range

> -----Original Message-----
> From: Andy Shevchenko [mailto:andy.shevchenko@...il.com]
> Sent: Friday, January 06, 2017 5:07 AM
> To: Kweh, Hock Leong <hock.leong.kweh@...el.com>
> Cc: David S. Miller <davem@...emloft.net>; Joao Pinto
> <Joao.Pinto@...opsys.com>; Giuseppe CAVALLARO <peppe.cavallaro@...com>;
> seraphin.bonnaffe@...com; Jarod Wilson <jarod@...hat.com>; Alexandre
> TORGUE <alexandre.torgue@...il.com>; Joachim Eastwood
> <manabian@...il.com>; Niklas Cassel <niklas.cassel@...s.com>; Johan Hovold
> <johan@...nel.org>; Pavel Machek <pavel@....cz>; lars.persson@...s.com;
> netdev <netdev@...r.kernel.org>; LKML <linux-kernel@...r.kernel.org>
> Subject: Re: [PATCH] net: stmmac: fix maxmtu assignment to be within valid
> range
> 
> On Thu, Jan 5, 2017 at 12:47 PM, Kweh, Hock Leong
> <hock.leong.kweh@...el.com> wrote:
> > From: "Kweh, Hock Leong" <hock.leong.kweh@...el.com>
> >
> > There is no checking valid value of maxmtu when getting it from devicetree.
> 
> 'Device Tree' or 'device tree' ?

Noted & Thanks. Submitting V2.

> 
> > This resolution added the checking condition to ensure the assignment
> > is made within a valid range.
> 
> > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > index 39eb7a6..683d59f 100644
> > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> > @@ -3319,7 +3319,8 @@ int stmmac_dvr_probe(struct device *device,
> >                 ndev->max_mtu = JUMBO_LEN;
> >         else
> >                 ndev->max_mtu = SKB_MAX_HEAD(NET_SKB_PAD + NET_IP_ALIGN);
> > -       if (priv->plat->maxmtu < ndev->max_mtu)
> > +       if ((priv->plat->maxmtu < ndev->max_mtu) &&
> > +           (priv->plat->maxmtu >= ndev->min_mtu))
> >                 ndev->max_mtu = priv->plat->maxmtu;
> 
> Perhaps add a warning message on else branch?

Noted & Thanks. Submitting V2.

> 
> --
> With Best Regards,
> Andy Shevchenko