linux-kernel - Re: [PATCH] skbuff: Mark expected switch fall-throughs

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Date:   Mon, 15 Oct 2018 14:30:31 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] skbuff: Mark expected switch fall-throughs

On Sat, Oct 13, 2018 at 4:56 AM, Gustavo A. R. Silva
<gustavo@...eddedor.com> wrote:
> In preparation to enabling -Wimplicit-fallthrough, mark switch cases
> where we are expecting to fall through.
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

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

-Kees

> ---
>  include/linux/skbuff.h | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> index 119d092..92ec346 100644
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -3505,13 +3505,19 @@ static inline bool __skb_metadata_differs(const struct sk_buff *skb_a,
>  #define __it(x, op) (x -= sizeof(u##op))
>  #define __it_diff(a, b, op) (*(u##op *)__it(a, op)) ^ (*(u##op *)__it(b, op))
>         case 32: diffs |= __it_diff(a, b, 64);
> +               /* fall through */
>         case 24: diffs |= __it_diff(a, b, 64);
> +               /* fall through */
>         case 16: diffs |= __it_diff(a, b, 64);
> +               /* fall through */
>         case  8: diffs |= __it_diff(a, b, 64);
>                 break;
>         case 28: diffs |= __it_diff(a, b, 64);
> +               /* fall through */
>         case 20: diffs |= __it_diff(a, b, 64);
> +               /* fall through */
>         case 12: diffs |= __it_diff(a, b, 64);
> +               /* fall through */
>         case  4: diffs |= __it_diff(a, b, 32);
>                 break;
>         }
> --
> 2.7.4
>



-- 
Kees Cook
Pixel Security