From 7e6eba619d6129ec7dcb07d3d0a26785f1c43af6 Mon Sep 17 00:00:00 2001 From: Michael Baum Date: Wed, 27 May 2020 08:37:52 +0000 Subject: [PATCH] net/mlx5: fix hairpin Tx queue creation error path The mlx5_txq_obj_hairpin_new function defines a pointer named tmpl and allocates memory for it using the rte_zmalloc_socket function. Later, this function allocates memory to a variable inside tmpl using the mlx5_devx_cmd_create_sq function. In both cases, if the allocation fails, the code jumps to the error label and frees allocated resources. However, in the first jump there are still no resources to free and the jump only for the line return NULL is unnecessary. Even worse, when it jumps to error label with invalid tmpl it actually does dereference to a null pointer. In contrast, the second jump needs to free the tmpl variable but the function instead of freeing, tries to free the variable that it just failed to allocate, and another variable that has never been allocated. In addition, for another error, the function returns NULL without freeing the tmpl variable before, causing a memory leak. Delete the error label and replace each jump with local return NULL and free tmpl variable if needed. Fixes: ae18a1ae9692 ("net/mlx5: support Tx hairpin queues") Cc: stable@dpdk.org Signed-off-by: Michael Baum Acked-by: Matan Azrad --- drivers/net/mlx5/mlx5_txq.c | 15 ++++----------- 1 file changed, 4 insertions(+), 11 deletions(-) diff --git a/drivers/net/mlx5/mlx5_txq.c b/drivers/net/mlx5/mlx5_txq.c index a211fa91b2..7cc620a90c 100644 --- a/drivers/net/mlx5/mlx5_txq.c +++ b/drivers/net/mlx5/mlx5_txq.c @@ -493,7 +493,6 @@ mlx5_txq_obj_hairpin_new(struct rte_eth_dev *dev, uint16_t idx) container_of(txq_data, struct mlx5_txq_ctrl, txq); struct mlx5_devx_create_sq_attr attr = { 0 }; struct mlx5_txq_obj *tmpl = NULL; - int ret = 0; uint32_t max_wq_data; MLX5_ASSERT(txq_data); @@ -505,7 +504,7 @@ mlx5_txq_obj_hairpin_new(struct rte_eth_dev *dev, uint16_t idx) "port %u Tx queue %u cannot allocate memory resources", dev->data->port_id, txq_data->idx); rte_errno = ENOMEM; - goto error; + return NULL; } tmpl->type = MLX5_TXQ_OBJ_TYPE_DEVX_HAIRPIN; tmpl->txq_ctrl = txq_ctrl; @@ -518,6 +517,7 @@ mlx5_txq_obj_hairpin_new(struct rte_eth_dev *dev, uint16_t idx) DRV_LOG(ERR, "total data size %u power of 2 is " "too large for hairpin", priv->config.log_hp_size); + rte_free(tmpl); rte_errno = ERANGE; return NULL; } @@ -537,22 +537,15 @@ mlx5_txq_obj_hairpin_new(struct rte_eth_dev *dev, uint16_t idx) DRV_LOG(ERR, "port %u tx hairpin queue %u can't create sq object", dev->data->port_id, idx); + rte_free(tmpl); rte_errno = errno; - goto error; + return NULL; } DRV_LOG(DEBUG, "port %u sxq %u updated with %p", dev->data->port_id, idx, (void *)&tmpl); rte_atomic32_inc(&tmpl->refcnt); LIST_INSERT_HEAD(&priv->txqsobj, tmpl, next); return tmpl; -error: - ret = rte_errno; /* Save rte_errno before cleanup. */ - if (tmpl->tis) - mlx5_devx_cmd_destroy(tmpl->tis); - if (tmpl->sq) - mlx5_devx_cmd_destroy(tmpl->sq); - rte_errno = ret; /* Restore rte_errno. */ - return NULL; } /** -- 2.20.1