[PATCH 3/5] net/hns3: fix double free for Rx/Tx queue

[Jie Hai <haijie1@huawei.com>]

From: Dengdui Huang <huangdengdui@huawei.com>

The Pointers to some resources on the Rx/Tx queue need to be set to NULL
after free inside the hns3_rx/tx_queue_release(), as this function is
called from multiple threads (reset thread, device config thread, etc),
leading to double memory free error.

Fixes: bba636698316 ("net/hns3: support Rx/Tx and related operations")
Cc: stable@dpdk.org

Signed-off-by: Dengdui Huang <huangdengdui@huawei.com>
Signed-off-by: Jie Hai <haijie1@huawei.com>
---
 drivers/net/hns3/hns3_rxtx.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/net/hns3/hns3_rxtx.c b/drivers/net/hns3/hns3_rxtx.c
index 54bf724a0e6c..fbc5ef3225c5 100644
--- a/drivers/net/hns3/hns3_rxtx.c
+++ b/drivers/net/hns3/hns3_rxtx.c
@@ -86,9 +86,14 @@ hns3_rx_queue_release(void *queue)
 	struct hns3_rx_queue *rxq = queue;
 	if (rxq) {
 		hns3_rx_queue_release_mbufs(rxq);
-		if (rxq->mz)
+		if (rxq->mz) {
 			rte_memzone_free(rxq->mz);
-		rte_free(rxq->sw_ring);
+			rxq->mz = NULL;
+		}
+		if (rxq->sw_ring) {
+			rte_free(rxq->sw_ring);
+			rxq->sw_ring = NULL;
+		}
 		rte_free(rxq);
 	}
 }
@@ -99,10 +104,18 @@ hns3_tx_queue_release(void *queue)
 	struct hns3_tx_queue *txq = queue;
 	if (txq) {
 		hns3_tx_queue_release_mbufs(txq);
-		if (txq->mz)
+		if (txq->mz) {
 			rte_memzone_free(txq->mz);
-		rte_free(txq->sw_ring);
-		rte_free(txq->free);
+			txq->mz = NULL;
+		}
+		if (txq->sw_ring) {
+			rte_free(txq->sw_ring);
+			txq->sw_ring = NULL;
+		}
+		if (txq->free) {
+			rte_free(txq->free);
+			txq->free = NULL;
+		}
 		rte_free(txq);
 	}
 }
-- 
2.30.0