netdev - [PATCH net 2/2] virtio_net: fix missing lock protection on control

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Date: Tue, 28 May 2024 08:32:39 +0000
From: Hariprasad Kelam <hkelam@...vell.com>
To: Heng Qi <hengqi@...ux.alibaba.com>,
        "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>,
        "virtualization@...ts.linux.dev"
	<virtualization@...ts.linux.dev>
CC: "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        Eugenio Pérez
	<eperezma@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni
	<pabeni@...hat.com>, Jiri Pirko <jiri@...nulli.us>,
        Daniel Jurgens
	<danielj@...dia.com>
Subject: [PATCH net 2/2] virtio_net: fix missing lock protection on
 control_buf access



> Refactored the handling of control_buf to be within the cvq_lock critical
> section, mitigating race conditions between reading device responses and
> new command submissions.
> 
> Fixes: 6f45ab3e0409 ("virtio_net: Add a lock for the command VQ.")
> Signed-off-by: Heng Qi <hengqi@...ux.alibaba.com>
> ---
>  drivers/net/virtio_net.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index
> 6b0512a628e0..3d8407d9e3d2 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -2686,6 +2686,7 @@ static bool virtnet_send_command_reply(struct
> virtnet_info *vi, u8 class, u8 cmd  {
>  	struct scatterlist *sgs[5], hdr, stat;
>  	u32 out_num = 0, tmp, in_num = 0;
> +	bool ret;
>  	int err;
> 
>  	/* Caller should know better */
> @@ -2731,8 +2732,9 @@ static bool virtnet_send_command_reply(struct
> virtnet_info *vi, u8 class, u8 cmd
>  	}
> 
>  unlock:
> +	ret = vi->ctrl->status == VIRTIO_NET_OK;
>  	mutex_unlock(&vi->cvq_lock);
> -	return vi->ctrl->status == VIRTIO_NET_OK;
> +	return ret;
>  }
> 
>  static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
> --
> 2.32.0.3.g01195cf9f
> 
Reviewed-by: Hariprasad Kelam <hkelam@...vell.com>