netdev - Re: [PATCH 1/1] xen-netfront: update num

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Date:	Fri, 16 Oct 2015 11:56:57 +0100
From:	Wei Liu <wei.liu2@...rix.com>
To:	Joe Jin <joe.jin@...cle.com>
CC:	<wei.liu2@...rix.com>, Ian Campbell <ian.campbell@...rix.com>,
	"David S. Miller" <davem@...emloft.net>,
	"annie.li@...cle.com" <annie.li@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	<netdev@...r.kernel.org>, <xen-devel@...ts.xenproject.org>,
	<stable@...r.kernel.org>, David Vrabel <david.vrabel@...rix.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCH 1/1] xen-netfront: update num_queues to real created

CC David and Boris (Konrad was already a recipient).

On Thu, Oct 15, 2015 at 10:34:15AM +0800, Joe Jin wrote:
> Sometimes xennet_create_queues() may failed to created all requested
> queues, we need to update num_queues to real created to avoid NULL
> pointer dereference.
> 
> Signed-off-by: Joe Jin <joe.jin@...cle.com>
> Cc: Wei Liu <wei.liu2@...rix.com>
> Cc: Ian Campbell <ian.campbell@...rix.com>
> Cc: David S. Miller <davem@...emloft.net>
> ---
>  drivers/net/xen-netfront.c |    9 ++++++---
>  1 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
> index f821a97..d580aec 100644
> --- a/drivers/net/xen-netfront.c
> +++ b/drivers/net/xen-netfront.c
> @@ -1746,7 +1746,7 @@ static int xennet_create_queues(struct netfront_info *info,
>  		dev_err(&info->netdev->dev, "no queues\n");
>  		return -EINVAL;
>  	}
> -	return 0;
> +	return num_queues;
>  }
>  
>  /* Common code used when first setting up, and when resuming. */
> @@ -1788,9 +1788,12 @@ static int talk_to_netback(struct xenbus_device *dev,
>  	if (info->queues)
>  		xennet_destroy_queues(info);
>  
> -	err = xennet_create_queues(info, num_queues);
> -	if (err < 0)
> +	/* Update queues number to real created */
> +	num_queues = xennet_create_queues(info, num_queues);
> +	if (num_queues < 0) {
> +		err = num_queues;
>  		goto destroy_ring;
> +	}
>  
>  	/* Create shared ring, alloc event channel -- for each queue */
>  	for (i = 0; i < num_queues; ++i) {
> -- 
> 1.7.1
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