linux-kernel - Re: [PATCH] Mfd - Fix possible NULL derefrence.

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Message-ID: <CAHp75Vd=8XuSK5r6of-Z7_4NiJ9+o=xEyGx3botfSQGSbnUKzQ@mail.gmail.com>
Date:   Tue, 7 Feb 2017 13:51:34 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Shailendra Verma <shailendra.v@...sung.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        p.shailesh@...sung.com, ashish.kalra@...sung.com,
        Shailendra Verma <shailendra.capricorn@...il.com>
Subject: Re: [PATCH] Mfd - Fix possible NULL derefrence.

On Fri, Jan 27, 2017 at 1:16 PM, Shailendra Verma
<shailendra.v@...sung.com> wrote:
> of_match_device could return NULL, and so can cause a NULL
> pointer dereference later.

I think it's not possible.

> --- a/drivers/mfd/mc13xxx-i2c.c
> +++ b/drivers/mfd/mc13xxx-i2c.c
> @@ -80,6 +80,10 @@ static int mc13xxx_i2c_probe(struct i2c_client *client,
>         if (client->dev.of_node) {
>                 const struct of_device_id *of_id =
>                         of_match_device(mc13xxx_dt_ids, &client->dev);
> +               if (!of_id) {
> +                       dev_err(&client->dev, "Error: No device match found\n");
> +                       return -ENODEV;
> +               }
>                 mc13xxx->variant = of_id->data;
>         } else {
>                 mc13xxx->variant = (void *)id->driver_data;
> diff --git a/drivers/mfd/mc13xxx-spi.c b/drivers/mfd/mc13xxx-spi.c
> index cbc1e5e..97ab19c 100644
> --- a/drivers/mfd/mc13xxx-spi.c
> +++ b/drivers/mfd/mc13xxx-spi.c
> @@ -157,7 +157,10 @@ static int mc13xxx_spi_probe(struct spi_device *spi)
>         if (spi->dev.of_node) {
>                 const struct of_device_id *of_id =
>                         of_match_device(mc13xxx_dt_ids, &spi->dev);
> +               if (!of_id) {
> +                       dev_err(&spi->dev, "Error: No device match found\n");
> +                       return -ENODEV;
> +               }
>                 mc13xxx->variant = of_id->data;
>         } else {
>                 const struct spi_device_id *id_entry = spi_get_device_id(spi);
> --
> 1.7.9.5
>



-- 
With Best Regards,
Andy Shevchenko