netdev - [PATCH net-next] enetc: Fix an off by one in enetc_setup_tc

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Message-ID: <20200107131143.jqytedvewberqp5c@kili.mountain>
Date:   Tue, 7 Jan 2020 16:11:43 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Claudiu Manoil <claudiu.manoil@....com>, Po Liu <po.liu@....com>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH net-next] enetc: Fix an off by one in enetc_setup_tc_txtime()

The priv->tx_ring[] has 16 elements but only priv->num_tx_rings are
set up, the rest are NULL.  This ">" comparison should be ">=" to avoid
a potential crash.

Fixes: 0d08c9ec7d6e ("enetc: add support time specific departure base on the qos etf")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/net/ethernet/freescale/enetc/enetc_qos.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc_qos.c b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
index e910aaf0f5ec..00382b7c5bd8 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_qos.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
@@ -315,7 +315,7 @@ int enetc_setup_tc_txtime(struct net_device *ndev, void *type_data)
 
 	tc = qopt->queue;
 
-	if (tc < 0 || tc > priv->num_tx_rings)
+	if (tc < 0 || tc >= priv->num_tx_rings)
 		return -EINVAL;
 
 	/* Do not support TXSTART and TX CSUM offload simutaniously */
-- 
2.11.0