From: "Gustavo A. R. Silva" <gustavoars@kernel.org>
To: Sunil Goutham <sgoutham@marvell.com>,
Geetha sowjanya <gakula@marvell.com>,
Subbaraya Sundeep <sbhatta@marvell.com>,
hariprasad <hkelam@marvell.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Jesse Brandeburg <jesse.brandeburg@intel.com>,
Christina Jacob <cjacob@marvell.com>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavoars@kernel.org>,
linux-hardening@vger.kernel.org
Subject: [PATCH][next] octeontx2-pf: Fix out-of-bounds read in otx2_get_fecparam()
Date: Fri, 12 Feb 2021 06:23:10 -0600 [thread overview]
Message-ID: <20210212122310.GA262609@embeddedor> (raw)
Code at line 967 implies that rsp->fwdata.supported_fec may be up to 4:
967: if (rsp->fwdata.supported_fec <= FEC_MAX_INDEX)
If rsp->fwdata.supported_fec evaluates to 4, then there is an
out-of-bounds read at line 971 because fec is an array with
a maximum of 4 elements:
954 const int fec[] = {
955 ETHTOOL_FEC_OFF,
956 ETHTOOL_FEC_BASER,
957 ETHTOOL_FEC_RS,
958 ETHTOOL_FEC_BASER | ETHTOOL_FEC_RS};
959 #define FEC_MAX_INDEX 4
971: fecparam->fec = fec[rsp->fwdata.supported_fec];
Fix this by properly indexing fec[] with rsp->fwdata.supported_fec - 1.
In this case the proper indexes 0 to 3 are used when
rsp->fwdata.supported_fec evaluates to a range of 1 to 4, correspondingly.
Fixes: d0cf9503e908 ("octeontx2-pf: ethtool fec mode support")
Addresses-Coverity-ID: 1501722 ("Out-of-bounds read")
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
index 237e5d3321d4..f7e8ada32a26 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
@@ -968,7 +968,7 @@ static int otx2_get_fecparam(struct net_device *netdev,
if (!rsp->fwdata.supported_fec)
fecparam->fec = ETHTOOL_FEC_NONE;
else
- fecparam->fec = fec[rsp->fwdata.supported_fec];
+ fecparam->fec = fec[rsp->fwdata.supported_fec - 1];
}
return 0;
}
--
2.27.0
next reply other threads:[~2021-02-12 12:25 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-12 12:23 Gustavo A. R. Silva [this message]
-- strict thread matches above, loose matches on Subject: below --
2021-02-12 14:50 [PATCH][next] octeontx2-pf: Fix out-of-bounds read in otx2_get_fecparam() Hariprasad Kelam
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