linux-kernel - Re: [PATCH] device property: Fix the length used in PROPERTY_ENTRY

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Message-ID: <20190125143205.GP9224@smile.fi.intel.com>
Date:   Fri, 25 Jan 2019 16:32:05 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [PATCH] device property: Fix the length used in
 PROPERTY_ENTRY_STRING

On Wed, Jan 23, 2019 at 05:44:16PM +0300, Heikki Krogerus wrote:
> With string type property entries we need to use
> sizeof(const char *) instead of the number of characters as
> the length of the entry.
> 
> If the string was shorter then sizeof(const char *),
> attempts to read it would have failed with -EOVERFLOW. The
> problem has been hidden because all build-in string
> properties have had a string longer then 8 characters until
> now.
> 

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> Fixes: a85f42047533 ("device property: helper macros for property entry creation")
> Cc: stable@...r.kernel.org
> Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
>  include/linux/property.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/property.h b/include/linux/property.h
> index 3789ec755fb6..65d3420dd5d1 100644
> --- a/include/linux/property.h
> +++ b/include/linux/property.h
> @@ -258,7 +258,7 @@ struct property_entry {
>  #define PROPERTY_ENTRY_STRING(_name_, _val_)		\
>  (struct property_entry) {				\
>  	.name = _name_,					\
> -	.length = sizeof(_val_),			\
> +	.length = sizeof(const char *),			\
>  	.type = DEV_PROP_STRING,			\
>  	{ .value = { .str = _val_ } },			\
>  }
> -- 
> 2.20.1
> 

-- 
With Best Regards,
Andy Shevchenko