linux-kernel - Re: [PATCH 1/8] [media] v4l2-async: Use kmalloc_array() in v4l2_async_notifier

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Date:   Tue, 27 Dec 2016 11:52:29 +0200
From:   Sakari Ailus <sakari.ailus@....fi>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:     linux-media@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Jan Kara <jack@...e.cz>,
        Javier Martinez Canillas <javier@....samsung.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michal Hocko <mhocko@...e.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/8] [media] v4l2-async: Use kmalloc_array() in
 v4l2_async_notifier_unregister()

Thanks!

On Mon, Dec 26, 2016 at 09:43:23PM +0100, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Mon, 26 Dec 2016 18:14:33 +0100
> 
> A multiplication for the size determination of a memory allocation
> indicated that an array data structure should be processed.
> Thus use the corresponding function "kmalloc_array".
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>

Acked-by: Sakari Ailus <sakari.ailus@...ux.intel.com>

> ---
>  drivers/media/v4l2-core/v4l2-async.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
> index 5bada202b2d3..277183f2d514 100644
> --- a/drivers/media/v4l2-core/v4l2-async.c
> +++ b/drivers/media/v4l2-core/v4l2-async.c
> @@ -202,7 +202,7 @@ void v4l2_async_notifier_unregister(struct v4l2_async_notifier *notifier)
>  	if (!notifier->v4l2_dev)
>  		return;
>  
> -	dev = kmalloc(n_subdev * sizeof(*dev), GFP_KERNEL);
> +	dev = kmalloc_array(n_subdev, sizeof(*dev), GFP_KERNEL);
>  	if (!dev) {
>  		dev_err(notifier->v4l2_dev->dev,
>  			"Failed to allocate device cache!\n");

-- 
Sakari Ailus
e-mail: sakari.ailus@....fi	XMPP: sailus@...iisi.org.uk