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

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Message-ID: <20170127113112.GA2042@kroah.com>
Date:   Fri, 27 Jan 2017 12:31:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Shailendra Verma <shailendra.v@...sung.com>
Cc:     Jiri Slaby <jslaby@...e.com>, linux-serial@...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] Tty: serial - Fix possible NULL derefrence.

On Fri, Jan 27, 2017 at 04:46:13PM +0530, Shailendra Verma wrote:
> of_match_device could return NULL, and so can cause a NULL
> pointer dereference later.
> 
> Signed-off-by: Shailendra Verma <shailendra.v@...sung.com>
> ---
>  drivers/tty/serial/max310x.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
> index 8a3e926..a94d147 100644
> --- a/drivers/tty/serial/max310x.c
> +++ b/drivers/tty/serial/max310x.c
> @@ -1323,6 +1323,10 @@ static int max310x_spi_probe(struct spi_device *spi)
>  	if (spi->dev.of_node) {
>  		const struct of_device_id *of_id =
>  			of_match_device(max310x_dt_ids, &spi->dev);
> +		if (!of_id) {
> +			dev_err(&spi->dev, "Error: No device match found\n");
> +			return -ENODEV;
> +		}

Have you ever hit this with a "real" system?

thanks,

greg k-h