linux-kernel - Re: [PATCH 1/4] net: sctp: Rename fallthrough label to unhandled

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Message-ID: <CAKwvOdmtfUfpGhKODa=UBtq7AKDaJa9cndf7fkjJw1R37SsR6A@mail.gmail.com>
Date:   Mon, 7 Oct 2019 11:08:45 -0700
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Vlad Yasevich <vyasevich@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Pavel Machek <pavel@....cz>,
        "Gustavo A . R . Silva" <gustavo@...eddedor.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Shawn Landden <shawn@....icu>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Miller <davem@...emloft.net>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        linux-sctp@...r.kernel.org,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/4] net: sctp: Rename fallthrough label to unhandled

On Sat, Oct 5, 2019 at 9:46 AM Joe Perches <joe@...ches.com> wrote:
>
> fallthrough may become a pseudo reserved keyword so this only use of
> fallthrough is better renamed to allow it.
>
> Signed-off-by: Joe Perches <joe@...ches.com>
> ---
>  net/sctp/sm_make_chunk.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> index e41ed2e0ae7d..48d63956a68c 100644
> --- a/net/sctp/sm_make_chunk.c
> +++ b/net/sctp/sm_make_chunk.c
> @@ -2155,7 +2155,7 @@ static enum sctp_ierror sctp_verify_param(struct net *net,
>         case SCTP_PARAM_SET_PRIMARY:
>                 if (ep->asconf_enable)
>                         break;
> -               goto fallthrough;
> +               goto unhandled;
>
>         case SCTP_PARAM_HOST_NAME_ADDRESS:
>                 /* Tell the peer, we won't support this param.  */
> @@ -2166,11 +2166,11 @@ static enum sctp_ierror sctp_verify_param(struct net *net,
>         case SCTP_PARAM_FWD_TSN_SUPPORT:
>                 if (ep->prsctp_enable)
>                         break;
> -               goto fallthrough;
> +               goto unhandled;
>
>         case SCTP_PARAM_RANDOM:
>                 if (!ep->auth_enable)
> -                       goto fallthrough;
> +                       goto unhandled;
>
>                 /* SCTP-AUTH: Secion 6.1
>                  * If the random number is not 32 byte long the association
> @@ -2187,7 +2187,7 @@ static enum sctp_ierror sctp_verify_param(struct net *net,
>
>         case SCTP_PARAM_CHUNKS:
>                 if (!ep->auth_enable)
> -                       goto fallthrough;
> +                       goto unhandled;
>
>                 /* SCTP-AUTH: Section 3.2
>                  * The CHUNKS parameter MUST be included once in the INIT or
> @@ -2203,7 +2203,7 @@ static enum sctp_ierror sctp_verify_param(struct net *net,
>
>         case SCTP_PARAM_HMAC_ALGO:
>                 if (!ep->auth_enable)
> -                       goto fallthrough;
> +                       goto unhandled;
>
>                 hmacs = (struct sctp_hmac_algo_param *)param.p;
>                 n_elt = (ntohs(param.p->length) -
> @@ -2226,7 +2226,7 @@ static enum sctp_ierror sctp_verify_param(struct net *net,
>                         retval = SCTP_IERROR_ABORT;
>                 }
>                 break;
> -fallthrough:
> +unhandled:
>         default:

Interesting control flow (goto from one case to the default case, not
sure "fallthrough" was ever the right word for that).  Thanks for the
patch.
Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

>                 pr_debug("%s: unrecognized param:%d for chunk:%d\n",
>                          __func__, ntohs(param.p->type), cid);
> --
> 2.15.0
>


-- 
Thanks,
~Nick Desaulniers