linux-kernel - Re: [PATCH] xen-netback: corretly check failed allocation

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Date:	Thu, 15 Oct 2015 23:32:18 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	wuninsu@...il.com
Cc:	ian.campbell@...rix.com, wei.liu2@...rix.com,
	xen-devel@...ts.xenproject.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, taesoo@...ech.edu,
	yeongjin.jang@...ech.edu, insu@...ech.edu
Subject: Re: [PATCH] xen-netback: corretly check failed allocation

From: Insu Yun <wuninsu@...il.com>
Date: Thu, 15 Oct 2015 12:26:16 -0400

> Since vzalloc can be failed in memory pressure,
> return value should be checked and return ENOMEM.
> 
> Signed-off-by: Insu Yun <wuninsu@...il.com>
> ---
>  drivers/net/xen-netback/xenbus.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
> index 929a6e7..e288246 100644
> --- a/drivers/net/xen-netback/xenbus.c
> +++ b/drivers/net/xen-netback/xenbus.c
> @@ -788,6 +788,11 @@ static void connect(struct backend_info *be)
>  	/* Use the number of queues requested by the frontend */
>  	be->vif->queues = vzalloc(requested_num_queues *
>  				  sizeof(struct xenvif_queue));
> +  if (!be->vif->queues)  {
> +    xenbus_dev_fatal(dev, -ENOMEM, "allocating queues");
> +    return;
> +  }

This is definitely not indented correctly.
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