linux-kernel - Re: [PATCH] media: video-mux: fix null pointer dereferences

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Message-ID: <1552295898.3334.3.camel@pengutronix.de>
Date:   Mon, 11 Mar 2019 10:18:18 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Kangjie Lu <kjlu@....edu>
Cc:     pakki001@....edu, Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: video-mux: fix  null pointer dereferences

On Sat, 2019-03-09 at 01:20 -0600, Kangjie Lu wrote:
> devm_kcalloc may fail and return a null pointer. The fix returns
> -ENOMEM upon failures to avoid null pointer dereferences.
> 
> Signed-off-by: Kangjie Lu <kjlu@....edu>
> ---
>  drivers/media/platform/video-mux.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/media/platform/video-mux.c b/drivers/media/platform/video-mux.c
> index c33900e3c23e..4135165cdabe 100644
> --- a/drivers/media/platform/video-mux.c
> +++ b/drivers/media/platform/video-mux.c
> @@ -399,9 +399,14 @@ static int video_mux_probe(struct platform_device *pdev)
>  	vmux->active = -1;
>  	vmux->pads = devm_kcalloc(dev, num_pads, sizeof(*vmux->pads),
>  				  GFP_KERNEL);
> +	if (!vmux->pads)
> +		return -ENOMEM;
> +
>  	vmux->format_mbus = devm_kcalloc(dev, num_pads,
>  					 sizeof(*vmux->format_mbus),
>  					 GFP_KERNEL);
> +	if (!vmux->format_mbus)
> +		return -ENOMEM;
>  
>  	for (i = 0; i < num_pads; i++) {
>  		vmux->pads[i].flags = (i < num_pads - 1) ? MEDIA_PAD_FL_SINK

Thank you,
Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>

regards
Philipp