[dpdk-dev] [PATCH] net/virtio: fix incorrect cast of void *

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

From: Didier Pallard <didier.pallard@6wind.com>

The rx_queues and tx_queues fields of the data structure points to a struct
virtnet_rx or virtnet_tx. Casting it to a virtqueue is an error.

It does not trigger any bug because pointer is not dereferenced inside the
function, but it can become a bug if this code is copy/pasted and vq is
dereferenced.

Fixes: 01ad44fd374f ("net/virtio: split Rx/Tx queue")
Cc: stable@dpdk.org

Signed-off-by: Didier Pallard <didier.pallard@6wind.com>
Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
---
 drivers/net/virtio/virtio_ethdev.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
index c0ba83b06..b398f9960 100644
--- a/drivers/net/virtio/virtio_ethdev.c
+++ b/drivers/net/virtio/virtio_ethdev.c
@@ -893,7 +893,7 @@ static int virtio_dev_xstats_get_names(struct rte_eth_dev *dev,
 		/* Note: limit checked in rte_eth_xstats_names() */
 
 		for (i = 0; i < dev->data->nb_rx_queues; i++) {
-			struct virtqueue *rxvq = dev->data->rx_queues[i];
+			struct virtnet_rx *rxvq = dev->data->rx_queues[i];
 			if (rxvq == NULL)
 				continue;
 			for (t = 0; t < VIRTIO_NB_RXQ_XSTATS; t++) {
@@ -906,7 +906,7 @@ static int virtio_dev_xstats_get_names(struct rte_eth_dev *dev,
 		}
 
 		for (i = 0; i < dev->data->nb_tx_queues; i++) {
-			struct virtqueue *txvq = dev->data->tx_queues[i];
+			struct virtnet_tx *txvq = dev->data->tx_queues[i];
 			if (txvq == NULL)
 				continue;
 			for (t = 0; t < VIRTIO_NB_TXQ_XSTATS; t++) {
-- 
2.11.0