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To: Olivier Matz <olivier.matz@6wind.com>, dev@dpdk.org,
Yuanhan Liu <yliu@fridaylinux.org>
Cc: Didier Pallard <didier.pallard@6wind.com>, stable@dpdk.org
References: <20171214143343.28785-1-olivier.matz@6wind.com>
From: Maxime Coquelin <maxime.coquelin@redhat.com>
Message-ID: <c341541e-1609-5ea4-642f-f0e576104b94@redhat.com>
Date: Thu, 14 Dec 2017 15:49:32 +0100
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(mx1.redhat.com [10.5.110.31]); Thu, 14 Dec 2017 14:49:36 +0000 (UTC)
Subject: Re: [dpdk-dev] [PATCH] net/virtio: fix incorrect cast of void *
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On 12/14/2017 03:33 PM, Olivier Matz wrote:
> 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++) {
>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Thanks,
Maxime