linux-kernel - Re: [PATCH] selftests/landlock: Fix a resource leak

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Date:   Wed, 30 Aug 2023 11:01:47 +0200
From:   Mickaël Salaün <mic@...ikod.net>
To:     Ding Xiang <dingxiang@...s.chinamobile.com>
Cc:     shuah@...nel.org, linux-security-module@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests/landlock: Fix a resource leak

Hi,

Thanks for this fix. A few suggestions:

On Wed, Aug 30, 2023 at 02:08:58PM +0800, Ding Xiang wrote:
> The opened file should be closed before return,
> otherwise resource leak will occur
> 
> Signed-off-by: Ding Xiang <dingxiang@...s.chinamobile.com>
> ---
>  tools/testing/selftests/landlock/fs_test.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/landlock/fs_test.c b/tools/testing/selftests/landlock/fs_test.c
> index 83d565569512..687a66ea9799 100644
> --- a/tools/testing/selftests/landlock/fs_test.c
> +++ b/tools/testing/selftests/landlock/fs_test.c
> @@ -124,13 +124,17 @@ static bool supports_filesystem(const char *const filesystem)
>  		return true;
>  
>  	/* filesystem can be null for bind mounts. */
> -	if (!filesystem)
> +	if (!filesystem) {
> +		fclose(inf);
>  		return true;

Can you please change these two lines (and the next hunk) with a
`goto out` (and then don't add the if braces), initialize res to true
when it is declared, and add the `out` label below?

> +	}
>  
>  	len = snprintf(str, sizeof(str), "nodev\t%s\n", filesystem);
> -	if (len >= sizeof(str))
> +	if (len >= sizeof(str)) {
> +		fclose(inf);
>  		/* Ignores too-long filesystem names. */
>  		return true;
> +	}
>  
>  	res = fgrep(inf, str);

out:
>  	fclose(inf);
> -- 
> 2.38.1
> 
> 
>