net/mlx5: fix array overflow

VLAN id is limited to MLX5_MAX_VLAN_IDS which is not verified by the code
before trying to add a new VLAN filter.

Fixes: 272733b5ebfd ("net/mlx5: use flow to enable unicast traffic")

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>

diff --git a/drivers/net/mlx5/mlx5_vlan.c b/drivers/net/mlx5/mlx5_vlan.c
index 89874aa..6fc315e 100644 (file)
--- a/drivers/net/mlx5/mlx5_vlan.c
+++ b/drivers/net/mlx5/mlx5_vlan.c
@@ -61,6 +61,7 @@ mlx5_vlan_filter_set(struct rte_eth_dev *dev, uint16_t vlan_id, int on)
 {
        struct priv *priv = dev->data->dev_private;
        unsigned int i;
+       int ret = 0;
 
        priv_lock(priv);
        DEBUG("%p: %s VLAN filter ID %" PRIu16,
@@ -69,6 +70,11 @@ mlx5_vlan_filter_set(struct rte_eth_dev *dev, uint16_t vlan_id, int on)
        for (i = 0; (i != priv->vlan_filter_n); ++i)
                if (priv->vlan_filter[i] == vlan_id)
                        break;
+       /* Check if there's room for another VLAN filter. */
+       if (i == RTE_DIM(priv->vlan_filter)) {
+               ret = -ENOMEM;
+               goto out;
+       }
        if (i < priv->vlan_filter_n) {
                assert(priv->vlan_filter_n != 0);
                /* Enabling an existing VLAN filter has no effect. */
@@ -94,7 +100,7 @@ mlx5_vlan_filter_set(struct rte_eth_dev *dev, uint16_t vlan_id, int on)
                priv_dev_traffic_restart(priv, dev);
 out:
        priv_unlock(priv);
-       return 0;
+       return ret;
 }
 
 /**