linux-kernel - Re: [PATCH] tools/power turbostat: Fix file pointer leak

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Date:   Tue, 26 Apr 2022 21:39:26 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     Colin Ian King <colin.i.king@...il.com>
Cc:     Len Brown <lenb@...nel.org>, linux-pm@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tools/power turbostat: Fix file pointer leak

On Tue, Apr 26, 2022 at 02:16:07PM +0100, Colin Ian King wrote:
> Currently if a fscanf fails then an early return leaks an open
> file pointer. Fix this by fclosing the file before the return.
> Detected using static analysis with cppcheck:
> 
> tools/power/x86/turbostat/turbostat.c:2039:3: error: Resource leak: fp [resourceLeak]
> 
> Fixes: eae97e053fe3 ("tools/power turbostat: Support thermal throttle count print")
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>
> ---
>  tools/power/x86/turbostat/turbostat.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
> index e6779f599a8e..db431b31c4df 100644
> --- a/tools/power/x86/turbostat/turbostat.c
> +++ b/tools/power/x86/turbostat/turbostat.c
> @@ -2035,9 +2035,9 @@ int get_core_throt_cnt(int cpu, unsigned long long *cnt)
>  	if (!fp)
>  		return -1;
>  	ret = fscanf(fp, "%lld", &tmp);
> +	fclose(fp);
>  	if (ret != 1)
>  		return -1;
> -	fclose(fp);
>  	*cnt = tmp;
>  
>  	return 0;
Acked-by: Chen Yu <yu.c.chen@...el.com>

Thanks for fixing it.


Chenyu