linux-kernel - [PATCH v2] net: stmmac: fix maxmtu assignment to be within valid range

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Message-Id: <1483697306-10063-1-git-send-email-hock.leong.kweh@intel.com>
Date:   Fri,  6 Jan 2017 18:08:26 +0800
From:   "Kweh, Hock Leong" <hock.leong.kweh@...el.com>
To:     "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>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Alexandre TORGUE <alexandre.torgue@...il.com>,
        Joachim Eastwood <manabian@...il.com>,
        Niklas Cassel <niklas.cassel@...s.com>,
        Johan Hovold <johan@...nel.org>, pavel@....cz,
        "Kweh, Hock Leong" <hock.leong.kweh@...el.com>,
        lars.persson@...s.com, netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] net: stmmac: fix maxmtu assignment to be within valid range

From: "Kweh, Hock Leong" <hock.leong.kweh@...el.com>

There is no checking valid value of maxmtu when getting it from device tree.
This resolution added the checking condition to ensure the assignment is
made within a valid range.

Signed-off-by: Kweh, Hock Leong <hock.leong.kweh@...el.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 92ac006..4df555e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3345,8 +3345,14 @@ 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;
+	else if (priv->plat->maxmtu != 0)
+		netdev_warn(priv->dev,
+			    "%s: warning: maxmtu having invalid value (%d)\n",
+			    __func__, priv->plat->maxmtu);
 
 	if (flow_ctrl)
 		priv->flow_ctrl = FLOW_AUTO;	/* RX/TX pause on */
-- 
1.7.9.5