net/mlx5: fix Rx/Tx queue checks

[ upstream commit 94e257e ]

When device configuration was interrupted by a signal,
mlx5_rxq/txq_release() could access yet unitinialized array
and crash the application. Add checks whether queue array
is initialized.

Fixes: a1366b1 ("net/mlx5: add reference counter on DPDK Rx queues")
Fixes: 6e78005 ("net/mlx5: add reference counter on DPDK Tx queues")

Signed-off-by: Dmitry Kozlyuk <dkozlyuk@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>

drivers/net/mlx5/mlx5_rxq.c

@@ -2074,7 +2074,7 @@ mlx5_rxq_release(struct rte_eth_dev *dev, uint16_t idx)
 	struct mlx5_priv *priv = dev->data->dev_private;
 	struct mlx5_rxq_ctrl *rxq_ctrl;
 
-	if (!(*priv->rxqs)[idx])
+	if (priv->rxqs == NULL || (*priv->rxqs)[idx] == NULL)
 		return 0;
 	rxq_ctrl = container_of((*priv->rxqs)[idx], struct mlx5_rxq_ctrl, rxq);
 	assert(rxq_ctrl->priv);

drivers/net/mlx5/mlx5_txq.c

@@ -1410,7 +1410,7 @@ mlx5_txq_release(struct rte_eth_dev *dev, uint16_t idx)
 	struct mlx5_priv *priv = dev->data->dev_private;
 	struct mlx5_txq_ctrl *txq;
 
-	if (!(*priv->txqs)[idx])
+	if (priv->txqs == NULL || (*priv->txqs)[idx] == NULL)
 		return 0;
 	txq = container_of((*priv->txqs)[idx], struct mlx5_txq_ctrl, txq);
 	if (txq->obj && !mlx5_txq_obj_release(txq->obj))