[dpdk-stable] [18.05] crypto/virtio: fix memory leak

[Pablo de Lara]

[ backported from upstream commit 4487cfa1fa5302a14e7001265b1fe46cf701933b ]

Put session private data back to mempool when clearing
a crypto session, which is expected to be done in the PMD.

Fixes: b7fa78c7d3b0 ("crypto/virtio: support session related ops")
Cc: stable at dpdk.org

Signed-off-by: Pablo de Lara <pablo.de.lara.guarch at intel.com>
Reviewed-by: Jay Zhou <jianjay.zhou at huawei.com>
---
 drivers/crypto/virtio/virtio_cryptodev.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/virtio/virtio_cryptodev.c b/drivers/crypto/virtio/virtio_cryptodev.c
index df88953f6..79bae1958 100644
--- a/drivers/crypto/virtio/virtio_cryptodev.c
+++ b/drivers/crypto/virtio/virtio_cryptodev.c
@@ -1080,7 +1080,10 @@ virtio_crypto_sym_clear_session(
 	VIRTIO_CRYPTO_SESSION_LOG_INFO("Close session %"PRIu64" successfully ",
 			session->session_id);
 
-	memset(sess, 0, sizeof(struct virtio_crypto_session));
+	memset(session, 0, sizeof(struct virtio_crypto_session));
+	struct rte_mempool *sess_mp = rte_mempool_from_obj(session);
+	set_session_private_data(sess, cryptodev_virtio_driver_id, NULL);
+	rte_mempool_put(sess_mp, session);
 	rte_free(malloc_virt_addr);
 }
 
-- 
2.14.4