linux-kernel - Re: [PATCH 2/2] OPP: debugfs: Fix warning around icc_get

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Date: Mon, 4 Mar 2024 17:22:49 +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>
Subject: Re: [PATCH 2/2] OPP: debugfs: Fix warning around icc_get_name()

Hi,

On 04/03/24 16:52, Viresh Kumar wrote:
> If the kernel isn't built with interconnect support, icc_get_name()
> returns NULL and we get following warning:
> 
> drivers/opp/debugfs.c: In function 'bw_name_read':
> drivers/opp/debugfs.c:43:42: error: '%.62s' directive argument is null [-Werror=format-overflow=]
>           i = scnprintf(buf, sizeof(buf), "%.62s\n", icc_get_name(path));
> 
> Fix it.
> 
> 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>
> ---

Do we not need this:

Fixes: 0430b1d5704b0 ("opp: Expose bandwidth information via debugfs")

?

>   drivers/opp/debugfs.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/opp/debugfs.c b/drivers/opp/debugfs.c
> index 27c3748347af..a9ebfdf0b6a1 100644
> --- a/drivers/opp/debugfs.c
> +++ b/drivers/opp/debugfs.c
> @@ -37,10 +37,12 @@ static ssize_t bw_name_read(struct file *fp, char __user *userbuf,
>   			    size_t count, loff_t *ppos)
>   {
>   	struct icc_path *path = fp->private_data;
> +	const char *name = icc_get_name(path);
>   	char buf[64];
> -	int i;
> +	int i = 0;
>   
> -	i = scnprintf(buf, sizeof(buf), "%.62s\n", icc_get_name(path));
> +	if (name)
> +		i = scnprintf(buf, sizeof(buf), "%.62s\n", name);

Reviewed-by: Dhruva Gole <d-gole@...com>

>   
>   	return simple_read_from_buffer(userbuf, count, ppos, buf, i);
>   }

-- 
Thanks and Regards,
Dhruva Gole