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net: mvpp2: cls: Prevent buffer overflow in mvpp2_ethtool_cls_rule_del()

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The "info->fs.location" is a u32 that comes from the user via the
ethtool_set_rxnfc() function.  We need to check for invalid values to
prevent a buffer overflow.

I copy and pasted this check from the mvpp2_ethtool_cls_rule_ins()
function.

Fixes: 90b509b39a ("net: mvpp2: cls: Add Classification offload support")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter 2020-05-06 13:16:56 +03:00 committed by David S. Miller
parent 39bd16df7c
commit 722c0f00d4
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
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@ -1428,6 +1428,9 @@ int mvpp2_ethtool_cls_rule_del(struct mvpp2_port *port,
struct mvpp2_ethtool_fs *efs;
int ret;
if (info->fs.location >= MVPP2_N_RFS_ENTRIES_PER_FLOW)
return -EINVAL;
efs = port->rfs_rules[info->fs.location];
if (!efs)
return -EINVAL;