netdev - [PATCH net] octeontx2-pf: fix a buffer overflow in otx2_set_rxfh

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Date:   Wed, 12 May 2021 13:11:43 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Sunil Goutham <sgoutham@...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>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH net] octeontx2-pf: fix a buffer overflow in
 otx2_set_rxfh_context()

This function is called from ethtool_set_rxfh() and "*rss_context"
comes from the user.  Add some bounds checking to prevent memory
corruption.

Fixes: 81a4362016e7 ("octeontx2-pf: Add RSS multi group support")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
index f4962a97a075..9d9a2e438acf 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
@@ -786,6 +786,10 @@ static int otx2_set_rxfh_context(struct net_device *dev, const u32 *indir,
 	if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
 		return -EOPNOTSUPP;
 
+	if (*rss_context != ETH_RXFH_CONTEXT_ALLOC &&
+	    *rss_context >= MAX_RSS_GROUPS)
+		return -EINVAL;
+
 	rss = &pfvf->hw.rss_info;
 
 	if (!rss->enable) {
-- 
2.30.2