[PATCH v3] net/af_xdp: fix resources leak when xsk configure fails

[Yunjian Wang]

In xdp_umem_configure() allocated some resources for the
xsk umem, we should delete them when xsk configure fails,
otherwise it will lead to resources leak.

Fixes: f1debd77efaf ("net/af_xdp: introduce AF_XDP PMD")
Cc: stable at dpdk.org

Signed-off-by: Yunjian Wang <wangyunjian at huawei.com>
---
v3: remove unnecessary null check
v2: update code style as suggested by Maryam Tahhan
---
 drivers/net/af_xdp/rte_eth_af_xdp.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c
index 2d151e45c7..93c6f3b723 100644
--- a/drivers/net/af_xdp/rte_eth_af_xdp.c
+++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
@@ -960,6 +960,8 @@ remove_xdp_program(struct pmd_internals *internals)
 static void
 xdp_umem_destroy(struct xsk_umem_info *umem)
 {
+	(void)xsk_umem__delete(umem->umem);
+	umem->umem = NULL;
 #if defined(XDP_UMEM_UNALIGNED_CHUNK_FLAG)
 	umem->mb_pool = NULL;
 #else
@@ -992,11 +994,8 @@ eth_dev_close(struct rte_eth_dev *dev)
 			break;
 		xsk_socket__delete(rxq->xsk);
 
-		if (__atomic_fetch_sub(&rxq->umem->refcnt, 1, __ATOMIC_ACQUIRE) - 1
-				== 0) {
-			(void)xsk_umem__delete(rxq->umem->umem);
+		if (__atomic_fetch_sub(&rxq->umem->refcnt, 1, __ATOMIC_ACQUIRE) - 1 == 0)
 			xdp_umem_destroy(rxq->umem);
-		}
 
 		/* free pkt_tx_queue */
 		rte_free(rxq->pair);
-- 
2.41.0