linux-kernel - Re: [PATCH] cpupower:Fix resource leaks in sysfs_get

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Date:   Thu, 13 Apr 2023 10:43:27 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Hao Zeng <zenghao@...inos.cn>, trenn@...e.com, shuah@...nel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] cpupower:Fix resource leaks in sysfs_get_enabled()

On 4/12/23 22:46, Hao Zeng wrote:
> The sysfs_get_enabled() opened file processor not closed,
> may cause a file handle leak.
> 

Please add information how you found this problem?

> Signed-off-by: Hao Zeng <zenghao@...inos.cn>
> ---
>   tools/power/cpupower/lib/powercap.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/power/cpupower/lib/powercap.c b/tools/power/cpupower/lib/powercap.c
> index 0ce29ee4c2e4..a39ee1c89679 100644
> --- a/tools/power/cpupower/lib/powercap.c
> +++ b/tools/power/cpupower/lib/powercap.c
> @@ -51,7 +51,7 @@ static int sysfs_get_enabled(char *path, int *mode)
>   		close(fd);
>   		return -1;
>   	}> -
> +	close(fd);

The error path logic can be simplified with a goto to
to handle the error path to close the file and return.

>   	if (yes_no == '1') {
>   		*mode = 1;
>   		return 0;

This path that returns 0 can be simplified as well to do
return just once, after error path handling is done with
a goto.

Please send me v2 with the changes above with information
on how you found the problem.

thanks,
-- Shuah

thanks,
-- Shuah