linux-kernel - Re: [PATCH] ab3100: fix off-by-one value range checking for voltage selector

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Message-Id: <F5EFB125-5C73-4DE5-8A4F-E0E92102D4F5@opensource.wolfsonmicro.com>
Date:	Mon, 26 Jul 2010 00:06:15 -0700
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Axel Lin <axel.lin@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Mattias Wallin <mattias.wallin@...ricsson.com>
Subject: Re: [PATCH] ab3100: fix off-by-one value range checking for voltage selector

On 25 Jul 2010, at 22:35, Axel Lin <axel.lin@...il.com> wrote:

> The valid typ_voltages range should be 0..voltages_len-1.
> 
> Signed-off-by: Axel Lin <axel.lin@...il.com>

Acked-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>

It'd be nice to include a few extra words in the change log explaining that the reason for the limit is that it's an array index.

> ---
> drivers/regulator/ab3100.c |    4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/regulator/ab3100.c b/drivers/regulator/ab3100.c
> index 7b14a67..1179099 100644
> --- a/drivers/regulator/ab3100.c
> +++ b/drivers/regulator/ab3100.c
> @@ -286,7 +286,7 @@ static int ab3100_list_voltage_regulator(struct regulator_dev *reg,
> {
>  	struct ab3100_regulator *abreg = reg->reg_data;
> 
> -	if (selector > abreg->voltages_len)
> +	if (selector >= abreg->voltages_len)
>  		return -EINVAL;
>  	return abreg->typ_voltages[selector];
> }
> @@ -318,7 +318,7 @@ static int ab3100_get_voltage_regulator(struct regulator_dev *reg)
>  	regval &= 0xE0;
>  	regval >>= 5;
> 
> -	if (regval > abreg->voltages_len) {
> +	if (regval >= abreg->voltages_len) {
>  		dev_err(&reg->dev,
>  			"regulator register %02x contains an illegal voltage setting\n",
>  			abreg->regreg);
> -- 
> 1.5.4.3
> 
> 
> 
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