linux-kernel - Re: [PATCH 1/6] GPU-DRM-GMA500: Use kmalloc_array() in mid_get_vbt_data

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Message-ID: <87vaxqlwb8.fsf@intel.com>
Date:   Tue, 20 Sep 2016 13:06:35 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        dri-devel@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Patrik Jakobsson <patrik.r.jakobsson@...il.com>
Cc:     Julia Lawall <julia.lawall@...6.fr>,
        kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/6] GPU-DRM-GMA500: Use kmalloc_array() in mid_get_vbt_data_r10()

On Tue, 20 Sep 2016, SF Markus Elfring <elfring@...rs.sourceforge.net> wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Tue, 20 Sep 2016 08:54:07 +0200
>
> 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.

Did you test this running on the hardware?

BR,
Jani.

>
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/gpu/drm/gma500/mid_bios.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/gma500/mid_bios.c b/drivers/gpu/drm/gma500/mid_bios.c
> index d75ecb3..a833568 100644
> --- a/drivers/gpu/drm/gma500/mid_bios.c
> +++ b/drivers/gpu/drm/gma500/mid_bios.c
> @@ -235,7 +235,7 @@ static int mid_get_vbt_data_r10(struct drm_psb_private *dev_priv, u32 addr)
>  	if (read_vbt_r10(addr, &vbt))
>  		return -1;
>  
> -	gct = kmalloc(sizeof(*gct) * vbt.panel_count, GFP_KERNEL);
> +	gct = kmalloc_array(vbt.panel_count, sizeof(*gct), GFP_KERNEL);
>  	if (!gct)
>  		return -1;

-- 
Jani Nikula, Intel Open Source Technology Center