[PATCH AUTOSEL for 4.9 024/281] net/mlx4_en: Avoid adding steering rules with invalid ring

[Sasha Levin]

From: Talat Batheesh <tal...@mellanox.com>

[ Upstream commit 89c557687a32c294e9d25670a96e9287c09f2d5f ]

Inserting steering rules with illegal ring is an invalid operation,
block it.

Fixes: 820672812f82 ('net/mlx4_en: Manage flow steering rules with ethtool')
Signed-off-by: Talat Batheesh <tal...@mellanox.com>
Signed-off-by: Tariq Toukan <tar...@mellanox.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
---
 drivers/net/ethernet/mellanox/mlx4/en_ethtool.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c 
b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
index bdda17d2ea0f..674246b189c2 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
@@ -1520,6 +1520,11 @@ static int mlx4_en_flow_replace(struct net_device *dev,
                qpn = priv->drop_qp.qpn;
        else if (cmd->fs.ring_cookie & EN_ETHTOOL_QP_ATTACH) {
                qpn = cmd->fs.ring_cookie & (EN_ETHTOOL_QP_ATTACH - 1);
+               if (qpn < priv->rss_map.base_qpn ||
+                   qpn >= priv->rss_map.base_qpn + priv->rx_ring_num) {
+                       en_warn(priv, "rxnfc: QP (0x%x) doesn't exist\n", qpn);
+                       return -EINVAL;
+               }
        } else {
                if (cmd->fs.ring_cookie >= priv->rx_ring_num) {
                        en_warn(priv, "rxnfc: RX ring (%llu) doesn't exist\n",
-- 
2.14.1