[PATCH v2 2/5] vmxnet3: Avoid memory leak in vmxnet3_dev_rx_queue_setup.

[nickcooper-zhangtonghao <nic@opencloud.tech>]

This patch will check the "nb_desc" parameter for rx queue,
release the rxq and re-allocation it soon.

Signed-off-by: nickcooper-zhangtonghao <nic@opencloud.tech>
---
 drivers/net/vmxnet3/vmxnet3_rxtx.c | 30 ++++++++++++++++++------------
 1 file changed, 18 insertions(+), 12 deletions(-)

diff --git a/drivers/net/vmxnet3/vmxnet3_rxtx.c b/drivers/net/vmxnet3/vmxnet3_rxtx.c
index b109168..e77374f 100644
--- a/drivers/net/vmxnet3/vmxnet3_rxtx.c
+++ b/drivers/net/vmxnet3/vmxnet3_rxtx.c
@@ -926,6 +926,21 @@
 
 	PMD_INIT_FUNC_TRACE();
 
+	/* Rx vmxnet rings length should be between 128-4096 */
+	if (nb_desc < VMXNET3_DEF_RX_RING_SIZE) {
+		PMD_INIT_LOG(ERR, "VMXNET3 Rx Ring Size Min: 128");
+		return -EINVAL;
+	} else if (nb_desc > VMXNET3_RX_RING_MAX_SIZE) {
+		PMD_INIT_LOG(ERR, "VMXNET3 Rx Ring Size Max: 4096");
+		return -EINVAL;
+	}
+
+	/* Free memory prior to re-allocation if needed. */
+	if (dev->data->rx_queues[queue_idx] != NULL) {
+		vmxnet3_dev_rx_queue_release(dev->data->rx_queues[queue_idx]);
+		dev->data->rx_queues[queue_idx] = NULL;
+	}
+
 	rxq = rte_zmalloc("ethdev_rx_queue", sizeof(struct vmxnet3_rx_queue),
 			  RTE_CACHE_LINE_SIZE);
 	if (rxq == NULL) {
@@ -946,18 +961,9 @@
 	ring1 = &rxq->cmd_ring[1];
 	comp_ring = &rxq->comp_ring;
 
-	/* Rx vmxnet rings length should be between 256-4096 */
-	if (nb_desc < VMXNET3_DEF_RX_RING_SIZE) {
-		PMD_INIT_LOG(ERR, "VMXNET3 Rx Ring Size Min: 256");
-		return -EINVAL;
-	} else if (nb_desc > VMXNET3_RX_RING_MAX_SIZE) {
-		PMD_INIT_LOG(ERR, "VMXNET3 Rx Ring Size Max: 4096");
-		return -EINVAL;
-	} else {
-		ring0->size = nb_desc;
-		ring0->size &= ~VMXNET3_RING_SIZE_MASK;
-		ring1->size = ring0->size;
-	}
+	ring0->size = nb_desc;
+	ring0->size &= ~VMXNET3_RING_SIZE_MASK;
+	ring1->size = ring0->size;
 
 	comp_ring->size = ring0->size + ring1->size;
 
-- 
1.8.3.1