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Re: [Qemu-devel] [PATCH] vhost: check for vhost_ops before using.


From: Marc-André Lureau
Subject: Re: [Qemu-devel] [PATCH] vhost: check for vhost_ops before using.
Date: Wed, 03 Aug 2016 08:37:05 +0000

Hi

On Wed, Aug 3, 2016 at 9:25 AM Ilya Maximets <address@hidden> wrote:

> 'vhost_set_vring_enable()' tries to call function using pointer to
> 'vhost_ops' which can be already zeroized in 'vhost_dev_cleanup()'
> while vhost disconnection.
>
> Fix that by checking 'vhost_ops' before using. This fixes QEMU crash
> on calling 'ethtool -L eth0 combined 2' if vhost disconnected.
>
> Signed-off-by: Ilya Maximets <address@hidden>
> ---
>  hw/net/vhost_net.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
> index dc61dc1..f2d49ad 100644
> --- a/hw/net/vhost_net.c
> +++ b/hw/net/vhost_net.c
> @@ -428,7 +428,7 @@ int vhost_set_vring_enable(NetClientState *nc, int
> enable)
>
>      nc->vring_enable = enable;
>
> -    if (vhost_ops->vhost_set_vring_enable) {
> +    if (vhost_ops && vhost_ops->vhost_set_vring_enable) {
>          return vhost_ops->vhost_set_vring_enable(&net->dev, enable);
>      }
>

would be nice for 2.7,

Reviewed-by: Marc-André Lureau <address@hidden>

>
> --
> 2.7.4
>
>
> --
Marc-André Lureau


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