linux-kernel - Re: [PATCH] m68k/atari: Avoid VLA use in atari_switches

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Message-ID: <CAK8P3a35ZwkrE-zxRVbwvNEs4RZTuV+-eu3uRD2OaSnVnBG3EQ@mail.gmail.com>
Date:   Tue, 8 Jan 2019 14:25:21 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] m68k/atari: Avoid VLA use in atari_switches_setup()

On Mon, Jan 7, 2019 at 10:29 AM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> With gcc 7.3.0:
>
>     arch/m68k/atari/config.c: In function ‘atari_switches_setup’:
>     arch/m68k/atari/config.c:151:2: warning: ISO C90 forbids variable length array ‘switches’ [-Wvla]
>       char switches[strlen(str) + 1];
>       ^~~~
>
> Replace the variable size by the maximum kernel command line size (512
> bytes), which is an upper limit for all suboptions.
>
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Seems fine as long as COMMAND_LINE_SIZE never grows a lot. Some
architectures use 1024 or 2048, but m68k currently has 256 (you write
512 here).

     Arnd