[dpdk-stable] [dpdk-dev] [PATCH v2] net/netvsc: fix txq leak in error path

[wangyunjian <wangyunjian@huawei.com>]

From: Yunjian Wang <wangyunjian@huawei.com>

In hn_dev_tx_queue_setup() allocated memory for txq, we don't free it
when error happens and it will lead to memory leak.

We can check for tx_free_thresh at the beginning of the function to
fix it, before calling txq = rte_zmalloc_socket().

Fixes: cc0251813277 ("net/netvsc: split send buffers from Tx descriptors")
Cc: stable@dpdk.org

Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
---
v2:
  fix code styles suggested by Long Li
---
 drivers/net/netvsc/hn_rxtx.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/net/netvsc/hn_rxtx.c b/drivers/net/netvsc/hn_rxtx.c
index 65f1abae5..5d59db513 100644
--- a/drivers/net/netvsc/hn_rxtx.c
+++ b/drivers/net/netvsc/hn_rxtx.c
@@ -252,16 +252,6 @@ hn_dev_tx_queue_setup(struct rte_eth_dev *dev,
 
 	PMD_INIT_FUNC_TRACE();
 
-	txq = rte_zmalloc_socket("HN_TXQ", sizeof(*txq), RTE_CACHE_LINE_SIZE,
-				 socket_id);
-	if (!txq)
-		return -ENOMEM;
-
-	txq->hv = hv;
-	txq->chan = hv->channels[queue_idx];
-	txq->port_id = dev->data->port_id;
-	txq->queue_id = queue_idx;
-
 	tx_free_thresh = tx_conf->tx_free_thresh;
 	if (tx_free_thresh == 0)
 		tx_free_thresh = RTE_MIN(nb_desc / 4,
@@ -276,6 +266,15 @@ hn_dev_tx_queue_setup(struct rte_eth_dev *dev,
 		return -EINVAL;
 	}
 
+	txq = rte_zmalloc_socket("HN_TXQ", sizeof(*txq), RTE_CACHE_LINE_SIZE,
+				 socket_id);
+	if (!txq)
+		return -ENOMEM;
+
+	txq->hv = hv;
+	txq->chan = hv->channels[queue_idx];
+	txq->port_id = dev->data->port_id;
+	txq->queue_id = queue_idx;
 	txq->free_thresh = tx_free_thresh;
 
 	snprintf(name, sizeof(name),
-- 
2.23.0