net/mlx5: fix Verbs FD leak in secondary process

[ upstream commit bc5d8fd ]

FDs passed from rte_mp_msg are duplicated to the secondary process and
need to be closed.

Fixes: 9a8ab29 ("net/mlx5: replace IPC socket with EAL API")

Signed-off-by: Long Li <longli@microsoft.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>

drivers/net/mlx5/linux/mlx5_mp_os.c

@@ -177,14 +177,18 @@ struct rte_mp_msg mp_res;
 			mlx5_tx_uar_uninit_secondary(dev);
 			mlx5_proc_priv_uninit(dev);
 			ret = mlx5_proc_priv_init(dev);
-			if (ret)
+			if (ret) {
+				close(mp_msg->fds[0]);
 				return -rte_errno;
+			}
 			ret = mlx5_tx_uar_init_secondary(dev, mp_msg->fds[0]);
 			if (ret) {
+				close(mp_msg->fds[0]);
 				mlx5_proc_priv_uninit(dev);
 				return -rte_errno;
 			}
 		}
+		close(mp_msg->fds[0]);
 		rte_mb();
 		mp_init_msg(&priv->mp_id, &mp_res, param->type);
 		res->result = 0;

drivers/net/mlx5/linux/mlx5_os.c

@@ -933,6 +933,7 @@ mlx5_dev_spawn(struct rte_device *dpdk_dev,
 	DRV_LOG(DEBUG, "naming Ethernet device \"%s\"", name);
 	if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
 		struct mlx5_mp_id mp_id;
+		int fd;
 
 		eth_dev = rte_eth_dev_attach_secondary(name);
 		if (eth_dev == NULL) {
@@ -949,11 +950,12 @@ mlx5_dev_spawn(struct rte_device *dpdk_dev,
 			return NULL;
 		mlx5_mp_id_init(&mp_id, eth_dev->data->port_id);
 		/* Receive command fd from primary process */
-		err = mlx5_mp_req_verbs_cmd_fd(&mp_id);
-		if (err < 0)
+		fd = mlx5_mp_req_verbs_cmd_fd(&mp_id);
+		if (fd < 0)
 			goto err_secondary;
 		/* Remap UAR for Tx queues. */
-		err = mlx5_tx_uar_init_secondary(eth_dev, err);
+		err = mlx5_tx_uar_init_secondary(eth_dev, fd);
+		close(fd);
 		if (err)
 			goto err_secondary;
 		/*