linux-kernel - Re: [PATCH] drm/mediatek: check for memory allocation failure

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Message-ID: <1497339920.16952.2.camel@mtksdaap41>
Date:   Tue, 13 Jun 2017 15:45:20 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
CC:     <p.zabel@...gutronix.de>, <airlied@...ux.ie>,
        <matthias.bgg@...il.com>, <dri-devel@...ts.freedesktop.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] drm/mediatek: check for memory allocation failure

Hi, Christophe:

Applied to my branch mediatek-drm-next-4.13, thanks.

Regards,
CK

On Fri, 2017-06-09 at 21:27 +0200, Christophe JAILLET wrote:
> If 'devm_kmalloc_array' returns NULL, we should return -ENOMEM as already
> done a few lines above instead of deferencing a NULL pointer a few lines
> below.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 6582e1f56d37..cb32c9369f3a 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -559,6 +559,8 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>  	mtk_crtc->ddp_comp = devm_kmalloc_array(dev, mtk_crtc->ddp_comp_nr,
>  						sizeof(*mtk_crtc->ddp_comp),
>  						GFP_KERNEL);
> +	if (!mtk_crtc->ddp_comp)
> +		return -ENOMEM;
>  
>  	mtk_crtc->mutex = mtk_disp_mutex_get(priv->mutex_dev, pipe);
>  	if (IS_ERR(mtk_crtc->mutex)) {