From: Gustavo A. R. Silva <gustavoars@kernel.org>
Date: Fri, 12 Feb 2021 12:23:10 +0000 (-0600)
Subject: octeontx2-pf: Fix out-of-bounds read in otx2_get_fecparam()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=93efb0c65683;p=linux.git
octeontx2-pf: Fix out-of-bounds read in otx2_get_fecparam()
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>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c
index 237e5d3321d42..f7e8ada32a26e 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;
}