linux-kernel - Re: [PATCH] PM / wakeirq: check that wake IRQ is valid before accepting it

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Message-ID: <5644DD73.2090904@ti.com>
Date:	Thu, 12 Nov 2015 20:41:55 +0200
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Tony Lindgren <tony@...mide.com>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PM / wakeirq: check that wake IRQ is valid before
 accepting it

On 11/12/2015 08:26 PM, Dmitry Torokhov wrote:
> Check that IRQ number passed to dev_pm_set_wake_irq and
> dev_pm_set_dedicated_wake_irq is valid (not negative) before accepting it.
>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
>
> My recent change to i2c core introduced a code path that led to calling
> dev_pm_set_wake_irq(&client->dev, -ENOENT), which succeeded but
> obviously did the wrong thing. Checking the IRQ and bailing out early
> would have helped noticing this issue earlier.
>
>   drivers/base/power/wakeirq.c | 6 ++++++
>   1 file changed, 6 insertions(+)
>
> diff --git a/drivers/base/power/wakeirq.c b/drivers/base/power/wakeirq.c
> index eb6e674..0d77cd6 100644
> --- a/drivers/base/power/wakeirq.c
> +++ b/drivers/base/power/wakeirq.c
> @@ -68,6 +68,9 @@ int dev_pm_set_wake_irq(struct device *dev, int irq)
>   	struct wake_irq *wirq;
>   	int err;
>
> +	if (irq < 0)

<= 0 ?

> +		return -EINVAL;
> +
>   	wirq = kzalloc(sizeof(*wirq), GFP_KERNEL);
>   	if (!wirq)
>   		return -ENOMEM;
> @@ -167,6 +170,9 @@ int dev_pm_set_dedicated_wake_irq(struct device *dev, int irq)
>   	struct wake_irq *wirq;
>   	int err;
>
> +	if (irq < 0)
> +		return -EINVAL;
> +
>   	wirq = kzalloc(sizeof(*wirq), GFP_KERNEL);
>   	if (!wirq)
>   		return -ENOMEM;
>


-- 
regards,
-grygorii
--
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