linux-kernel - [PATCH net-next] octeontx2-pf: fix an off by one bug in otx2_get

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Message-ID: <YCqZvjAzSmJk5Ftb@mwanda>
Date:   Mon, 15 Feb 2021 18:56:46 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Sunil Goutham <sgoutham@...vell.com>,
        Christina Jacob <cjacob@...vell.com>
Cc:     Geetha sowjanya <gakula@...vell.com>,
        Subbaraya Sundeep <sbhatta@...vell.com>,
        hariprasad <hkelam@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH net-next] octeontx2-pf: fix an off by one bug in
 otx2_get_fecparam()

The "<= FEC_MAX_INDEX" comparison should be "< FEC_MAX_INDEX".

I did some cleanup in this function to hopefully make the code a bit
clearer.  There was no blank line after the declaration block.  The
closing curly brace on the fec[] declaration normally goes on a line
by itself.  And I removed the FEC_MAX_INDEX define and used
ARRAY_SIZE(fec) instead.

Fixes: d0cf9503e908 ("octeontx2-pf: ethtool fec mode support")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 .../net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c    | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
index 237e5d3321d4..0eaf11107cb7 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
@@ -955,16 +955,17 @@ static int otx2_get_fecparam(struct net_device *netdev,
 		ETHTOOL_FEC_OFF,
 		ETHTOOL_FEC_BASER,
 		ETHTOOL_FEC_RS,
-		ETHTOOL_FEC_BASER | ETHTOOL_FEC_RS};
-#define FEC_MAX_INDEX 4
-	if (pfvf->linfo.fec < FEC_MAX_INDEX)
+		ETHTOOL_FEC_BASER | ETHTOOL_FEC_RS,
+	};
+
+	if (pfvf->linfo.fec < ARRAY_SIZE(fec))
 		fecparam->active_fec = fec[pfvf->linfo.fec];
 
 	rsp = otx2_get_fwdata(pfvf);
 	if (IS_ERR(rsp))
 		return PTR_ERR(rsp);
 
-	if (rsp->fwdata.supported_fec <= FEC_MAX_INDEX) {
+	if (rsp->fwdata.supported_fec < ARRAY_SIZE(fec)) {
 		if (!rsp->fwdata.supported_fec)
 			fecparam->fec = ETHTOOL_FEC_NONE;
 		else
-- 
2.30.0