linux-kernel - Re: [PATCH] fpga: altera-hps2fpga: add NULL check on of_match

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Message-ID: <CAAtXAHdx8Q5OiLd2PfvDDtra5c8OCTcEoQNQhfBO-Zue9gsxHQ@mail.gmail.com>
Date:   Mon, 10 Jul 2017 09:25:56 -0700
From:   Moritz Fischer <moritz.fischer@...us.com>
To:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Cc:     Alan Tull <atull@...nel.org>, linux-fpga@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fpga: altera-hps2fpga: add NULL check on
 of_match_device() return value

On Thu, Jul 6, 2017 at 11:22 PM, Gustavo A. R. Silva
<garsilva@...eddedor.com> wrote:
> Check return value from call to of_match_device()
> in order to prevent a NULL pointer dereference.
>
> In case of NULL print error message and return -ENODEV
>
> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
Reviewed-by: Moritz Fischer <mdf@...nel.org>
> ---
>  drivers/fpga/altera-hps2fpga.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/drivers/fpga/altera-hps2fpga.c b/drivers/fpga/altera-hps2fpga.c
> index 3066b80..ca8212c 100644
> --- a/drivers/fpga/altera-hps2fpga.c
> +++ b/drivers/fpga/altera-hps2fpga.c
> @@ -143,6 +143,11 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev)
>         int ret;
>
>         of_id = of_match_device(altera_fpga_of_match, dev);
> +       if (!of_id) {
> +               dev_err(dev, "failed to match device\n");
> +               return -ENODEV;
> +       }
> +
>         priv = (struct altera_hps2fpga_data *)of_id->data;
>
>         priv->bridge_reset = of_reset_control_get_by_index(dev->of_node, 0);
> --
> 2.5.0
>