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dpaa2-eth: Fix potential spectre issue 

Smatch reports a potential spectre vulnerability in the dpaa2-eth
driver, where the value of rxnfc->fs.location (which is provided
from user-space) is used as index in an array.

Add a call to array_index_nospec() to sanitize the access.

Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ioana Radulescu 2019-05-24 18:15:15 +03:00 committed by David S. Miller
parent 334031219a
commit 5a20a093d9
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ethernet/freescale/dpaa2/dpaa2-ethtool.c
View File

@ -4,6 +4,7 @@
*/
#include <linux/net_tstamp.h>
#include <linux/nospec.h>
#include "dpni.h" /* DPNI_LINK_OPT_* */
#include "dpaa2-eth.h"
@ -648,6 +649,8 @@ static int dpaa2_eth_get_rxnfc(struct net_device *net_dev,
case ETHTOOL_GRXCLSRULE:
if (rxnfc->fs.location >= max_rules)
return -EINVAL;
rxnfc->fs.location = array_index_nospec(rxnfc->fs.location,
max_rules);
if (!priv->cls_rules[rxnfc->fs.location].in_use)
return -EINVAL;
rxnfc->fs = priv->cls_rules[rxnfc->fs.location].fs;