linux-kernel - Re: [PATCH][next] hwmon: axi-fan-control: fix uninitialized dereference of pointer res

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Date:   Tue, 11 Feb 2020 08:39:10 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Colin King <colin.king@...onical.com>
Cc:     Nuno Sá <nuno.sa@...log.com>,
        Jean Delvare <jdelvare@...e.com>, linux-hwmon@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] hwmon: axi-fan-control: fix uninitialized
 dereference of pointer res

On Tue, Feb 11, 2020 at 04:20:59PM +0000, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently the resource pointer ret is uninitialized and it is
> being dereferenced when printing out a debug message. Fix this
> by fetching the resource and assigning pointer res.  It is
> a moot point that we sanity check for a null res since a successful
> call to devm_platform_ioremap_resource has already occurred so
> in theory it should never be non-null.
> 
> Addresses-Coverity: ("Uninitialized pointer read")
> Fixes: 690dd9ce04f6 ("hwmon: Support ADI Fan Control IP")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

This has already been fixed by removing the message (and the
then unused variable). The message was useless anyway since
it printed the remapped address with %p.

Guenter

> ---
>  drivers/hwmon/axi-fan-control.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/hwmon/axi-fan-control.c b/drivers/hwmon/axi-fan-control.c
> index 8041ba7cc152..36e0d060510a 100644
> --- a/drivers/hwmon/axi-fan-control.c
> +++ b/drivers/hwmon/axi-fan-control.c
> @@ -415,6 +415,9 @@ static int axi_fan_control_probe(struct platform_device *pdev)
>  	if (!ctl->clk_rate)
>  		return -EINVAL;
>  
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res)
> +		return -EINVAL;
>  	dev_dbg(&pdev->dev, "Re-mapped from 0x%08llX to %p\n",
>  		(unsigned long long)res->start, ctl->base);
>  
> -- 
> 2.25.0
>