[PATCH 5.4 40/90] net: mvpp2: cls: Prevent buffer overflow in mvpp2_ethtool_cls_rule_del()

[Greg Kroah-Hartman]

From: Dan Carpenter <dan.carpen...@oracle.com>

[ Upstream commit 722c0f00d4feea77475a5dc943b53d60824a1e4e ]

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: 90b509b39ac9 ("net: mvpp2: cls: Add Classification offload support")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c
@@ -1422,6 +1422,9 @@ int mvpp2_ethtool_cls_rule_del(struct mv
        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;