linux-kernel - Re: [PATCH] thermal: Fix for setting the thermal zone mode to enable/disable

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Date:	Wed, 21 Mar 2012 15:13:57 +0100
From:	Jean Delvare <khali@...ux-fr.org>
To:	Amit Daniel Kachhap <amit.kachhap@...aro.org>
Cc:	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, lenb@...nel.org,
	linaro-dev@...ts.linaro.org, patches@...aro.org
Subject: Re: [PATCH] thermal: Fix for setting the thermal zone mode to
 enable/disable

On Wed, 21 Mar 2012 16:40:01 +0530, Amit Daniel Kachhap wrote:
> Basically without this patch changing the mode of thermal zone
> is not possible as wrong string size is passed to strncmp.

Actually it is possible,
$ echo -n disabled > mode
works fine. But it fails without the -n, your patch would fix that.

Acked-by: Jean Delvare <khali@...ux-fr.org>

Note that a quick grep suggests that drivers/misc/ad525x_dpot.c,
security/selinux/hooks.c and arch/m68k/sun3/prom/console.c suffer from
the same issue, if you want to fix them too.

> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@...aro.org>
> ---
>  drivers/thermal/thermal_sys.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
> index 220ce7e..96da1af 100644
> --- a/drivers/thermal/thermal_sys.c
> +++ b/drivers/thermal/thermal_sys.c
> @@ -152,9 +152,9 @@ mode_store(struct device *dev, struct device_attribute *attr,
>  	if (!tz->ops->set_mode)
>  		return -EPERM;
>  
> -	if (!strncmp(buf, "enabled", sizeof("enabled")))
> +	if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
>  		result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
> -	else if (!strncmp(buf, "disabled", sizeof("disabled")))
> +	else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
>  		result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
>  	else
>  		result = -EINVAL;


-- 
Jean Delvare
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