linux-kernel - Re: [PATCH] PM / clk: ensure we don't allocate a -ve size of count clks

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Message-ID: <20160416125235.GB31772@amd>
Date:	Sat, 16 Apr 2016 14:52:35 +0200
From:	Pavel Machek <pavel@....cz>
To:	Colin King <colin.king@...onical.com>
Cc:	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Len Brown <len.brown@...el.com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PM / clk: ensure we don't allocate a -ve size of count
 clks

On Sat 2016-04-16 13:50:03, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> It is entirely possible for of_count_phandle_wit_args to
> return a -ve error return value so we need to check for this
> otherwise we end up allocating a negative number of clk objects.
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Acked-by: Pavel Machek <pavel@....cz>


> diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c
> index 0e64a1b..3657ac1 100644
> --- a/drivers/base/power/clock_ops.c
> +++ b/drivers/base/power/clock_ops.c
> @@ -159,7 +159,7 @@ int of_pm_clk_add_clks(struct device *dev)
>  
>  	count = of_count_phandle_with_args(dev->of_node, "clocks",
>  					   "#clock-cells");
> -	if (count == 0)
> +	if (count <= 0)
>  		return -ENODEV;

Would it make sense to propagate the error value?

									Pavel

-- 
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