[PATCH v3 2/4] net/virtio: fix memory leak when reinitializing device

[Olivier Matz <olivier.matz@6wind.com>]

Free the previous queues and the attached mbufs before initializing new
ones.

The function virtio_dev_free_mbufs() is now called when reconfiguring the
device, so we also need to add a check to ensure that it won't crash for
uninitialized queues.

Cc: stable@dpdk.org
Fixes: 60e6f4707ef2 ("net/virtio: reinitialize device when configuring")

Signed-off-by: Zijie Pan <zijie.pan@6wind.com>
Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
---
 drivers/net/virtio/virtio_ethdev.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index 24ffbeeb2..500556a05 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -1471,6 +1471,11 @@ virtio_init_device(struct rte_eth_dev *eth_dev, uint64_t req_features)
 	/* Reset the device although not necessary at startup */
 	vtpci_reset(hw);
 
+	if (hw->vqs) {
+		virtio_dev_free_mbufs(eth_dev);
+		virtio_free_queues(hw);
+	}
+
 	/* Tell the host we've noticed this device. */
 	vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_ACK);
 
@@ -1968,6 +1973,9 @@ static void virtio_dev_free_mbufs(struct rte_eth_dev *dev)
 	for (i = 0; i < dev->data->nb_rx_queues; i++) {
 		struct virtnet_rx *rxvq = dev->data->rx_queues[i];
 
+		if (rxvq == NULL || rxvq->vq == NULL)
+			continue;
+
 		PMD_INIT_LOG(DEBUG,
 			     "Before freeing rxq[%d] used and unused buf", i);
 		VIRTQUEUE_DUMP(rxvq->vq);
@@ -1987,6 +1995,9 @@ static void virtio_dev_free_mbufs(struct rte_eth_dev *dev)
 	for (i = 0; i < dev->data->nb_tx_queues; i++) {
 		struct virtnet_tx *txvq = dev->data->tx_queues[i];
 
+		if (txvq == NULL || txvq->vq == NULL)
+			continue;
+
 		PMD_INIT_LOG(DEBUG,
 			     "Before freeing txq[%d] used and unused bufs",
 			     i);
-- 
2.11.0