linux-kernel - Re: [v1] gpu: drm: sti: sti_vtg:- Handle return NULL error from devm_ioremap

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Message-ID: <96f01b40-fb46-291b-7395-f95fef88be94@st.com>
Date:   Wed, 4 Jan 2017 09:29:24 +0000
From:   Vincent ABRIOU <vincent.abriou@...com>
To:     Arvind Yadav <arvind.yadav.cs@...il.com>,
        "benjamin.gaignard@...aro.org" <benjamin.gaignard@...aro.org>,
        "airlied@...ux.ie" <airlied@...ux.ie>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [v1] gpu: drm: sti: sti_vtg:- Handle return NULL error from
 devm_ioremap_nocache

Thanks for the patch.

Acked-by: Vincent Abriou <vincent.abriou@...com>

I will take it for pull request that should be issued by the end of the 
week.

Vincent

On 12/21/2016 06:30 AM, Arvind Yadav wrote:
> Here, If devm_ioremap_nocache will fail. It will return NULL.
> Kernel can run into a NULL-pointer dereference. This error check
> will avoid NULL pointer dereference.
>
> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
> ---
>  drivers/gpu/drm/sti/sti_vtg.c |    4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/sti/sti_vtg.c b/drivers/gpu/drm/sti/sti_vtg.c
> index a8882bd..c3d9c8a 100644
> --- a/drivers/gpu/drm/sti/sti_vtg.c
> +++ b/drivers/gpu/drm/sti/sti_vtg.c
> @@ -429,6 +429,10 @@ static int vtg_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  	}
>  	vtg->regs = devm_ioremap_nocache(dev, res->start, resource_size(res));
> +	if (!vtg->regs) {
> +		DRM_ERROR("failed to remap I/O memory\n");
> +		return -ENOMEM;
> +	}
>
>  	np = of_parse_phandle(pdev->dev.of_node, "st,slave", 0);
>  	if (np) {
>