linux-kernel - Re: [PATCH] OPP: debugfs: Fix warning with W=1 builds

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Date: Mon, 4 Mar 2024 13:12:53 +0530
From: Dhruva Gole <d-gole@...com>
To: Viresh Kumar <viresh.kumar@...aro.org>, Viresh Kumar <vireshk@...nel.org>,
        Nishanth Menon <nm@...com>, Stephen Boyd <sboyd@...nel.org>
CC: <linux-pm@...r.kernel.org>, Vincent Guittot <vincent.guittot@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        kernel test robot <lkp@...el.com>, <linux-kernel@...r.kernel.org>,
        Dhruva Gole <d-gole@...com>
Subject: Re: [PATCH] OPP: debugfs: Fix warning with W=1 builds

Hi Viresh,

On 04/03/24 12:50, Viresh Kumar wrote:
> We currently get the following warning:
> 
> debugfs.c:105:54: error: '%d' directive output may be truncated writing between 1 and 11 bytes into a region of size 8 [-Werror=format-truncation=]
>                   snprintf(name, sizeof(name), "supply-%d", i);
>                                                        ^~
> debugfs.c:105:46: note: directive argument in the range [-2147483644, 2147483646]
>                   snprintf(name, sizeof(name), "supply-%d", i);
>                                                ^~~~~~~~~~~
> debugfs.c:105:17: note: 'snprintf' output between 9 and 19 bytes into a destination of size 15
>                   snprintf(name, sizeof(name), "supply-%d", i);
> 
> Fix this and another potential issue it by increasing size of the arrays.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202402141313.81ltVF5g-lkp@intel.com/
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>   drivers/opp/debugfs.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/opp/debugfs.c b/drivers/opp/debugfs.c
> index ec030b19164a..96313aa55db6 100644
> --- a/drivers/opp/debugfs.c
> +++ b/drivers/opp/debugfs.c
> @@ -78,7 +78,7 @@ static void opp_debug_create_clks(struct dev_pm_opp *opp,
>   				  struct opp_table *opp_table,
>   				  struct dentry *pdentry)
>   {
> -	char name[12];
> +	char name[19];


I'd rather we use malloc or else change the limits of the
"rate_hz_%d" to "rate_hz_%4d" or how many ever digits makes sense.

[...]


-- 
Thanks and Regards,
Dhruva Gole