linux-kernel - Re: [PATCH][next] ima: Fix fall-through warning for Clang

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Date:   Tue, 8 Jun 2021 10:02:35 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Mimi Zohar <zohar@...ux.ibm.com>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] ima: Fix fall-through warning for Clang

On Mon, Jun 07, 2021 at 03:49:34PM -0500, Gustavo A. R. Silva wrote:
> In preparation to enable -Wimplicit-fallthrough for Clang, fix a
> fall-through warning by explicitly adding a break statement instead
> of just letting the code fall through to the next case.
> 
> Link: https://github.com/KSPP/linux/issues/115
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
> JFYI: We had thousands of these sorts of warnings and now we are down
>       to just 13 in linux-next(20210607). This is one of those last
>       remaining warnings. :)

Looks right to me; thanks!

Reviewed-by: Kees Cook <keescook@...omium.org>

> 
>  security/integrity/ima/ima_template_lib.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/security/integrity/ima/ima_template_lib.c b/security/integrity/ima/ima_template_lib.c
> index 518fd50ea48a..8f96247b4a5c 100644
> --- a/security/integrity/ima/ima_template_lib.c
> +++ b/security/integrity/ima/ima_template_lib.c
> @@ -119,6 +119,7 @@ static void ima_show_template_data_ascii(struct seq_file *m,
>  		default:
>  			break;
>  		}
> +		break;
>  	default:
>  		break;
>  	}
> -- 
> 2.27.0
> 

-- 
Kees Cook