netdev - Re: [net-next PATCH v2] net: dummy: Introduce dummy virtual functions

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Date:   Mon, 14 Nov 2016 06:23:11 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Phil Sutter <phil@....cc>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        Sabrina Dubroca <sd@...asysnail.net>
Subject: Re: [net-next PATCH v2] net: dummy: Introduce dummy virtual
 functions

On Mon, 2016-11-14 at 14:02 +0100, Phil Sutter wrote:
> The idea for this was born when testing VF support in iproute2 which was
> impeded by hardware requirements. In fact, not every VF-capable hardware
> driver implements all netdev ops, so testing the interface is still hard
> to do even with a well-sorted hardware shelf.
> 
...
>  static int dummy_dev_init(struct net_device *dev)
>  {
> +	struct dummy_priv *priv = netdev_priv(dev);
> +
>  	dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
>  	if (!dev->dstats)
>  		return -ENOMEM;
>  
> +	priv->num_vfs = num_vfs;
> +	priv->vfinfo = NULL;
> +
> +	if (!num_vfs)
> +		return 0;
> +
> +	priv->vfinfo = kcalloc(num_vfs, sizeof(struct vf_data_storage),
> +			       GFP_KERNEL);
> +	if (!priv->vfinfo)
> +		return -ENOMEM;

You must free dev->dstats here, otherwise kernel memory will leak. 

> +
>  	return 0;
>  }
>