linux-kernel - Re: [PATCH] phy: exynos5-usbdrd: Fix off-by-one valid value checking for args->args[0]

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Date:	Mon, 02 Mar 2015 16:41:41 +0530
From:	Vivek Gautam <gautam.vivek@...sung.com>
To:	Axel Lin <axel.lin@...ics.com>,
	Kishon Vijay Abraham I <kishon@...com>
Cc:	linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH] phy: exynos5-usbdrd: Fix off-by-one valid value checking
 for args->args[0]

Hi,

On Friday, February 27, 2015 9:14 PM "Axel Lin" <axel.lin@...ics.com> wrote:
> Current code uses args->args[0] as array subscript of phy_drd->phys[].
> So the valid value range for args->args[0] is 0 ... EXYNOS5_DRDPHYS_NUM - 
> 1.
>
> Signed-off-by: Axel Lin <axel.lin@...ics.com>

Reviewed by: Vivek Gautam <gautam.vivek@...sung.com>

> ---
> drivers/phy/phy-exynos5-usbdrd.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/phy/phy-exynos5-usbdrd.c 
> b/drivers/phy/phy-exynos5-usbdrd.c
> index 0437401..e2a0be7 100644
> --- a/drivers/phy/phy-exynos5-usbdrd.c
> +++ b/drivers/phy/phy-exynos5-usbdrd.c
> @@ -531,7 +531,7 @@ static struct phy *exynos5_usbdrd_phy_xlate(struct 
> device *dev,
> {
>  struct exynos5_usbdrd_phy *phy_drd = dev_get_drvdata(dev);
>
> - if (WARN_ON(args->args[0] > EXYNOS5_DRDPHYS_NUM))
> + if (WARN_ON(args->args[0] >= EXYNOS5_DRDPHYS_NUM))
>  return ERR_PTR(-ENODEV);
>
>  return phy_drd->phys[args->args[0]].phy;
> -- 
> 1.9.1
>

BRs
Vivek 

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