linux-kernel - Re: [PATCH 1/1] printk: fix parsing of "brl=" option

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Message-ID: <1471969508.3746.112.camel@perches.com>
Date:   Tue, 23 Aug 2016 09:25:08 -0700
From:   Joe Perches <joe@...ches.com>
To:     Nicolas Iooss <nicolas.iooss_linux@....org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] printk: fix parsing of "brl=" option

On Tue, 2016-08-23 at 17:47 +0200, Nicolas Iooss wrote:
> Commit bbeddf52adc1 ("printk: move braille console support into separate
> braille.[ch] files") moved the parsing of braille-related options into
> _braille_console_setup(), changing the type of variable str from char*
> to char**. In this commit, memcmp(str, "brl,", 4) was correctly updated
> to memcmp(*str, "brl,", 4) but not memcmp(str, "brl=", 4).
> 
> Update the code to make "brl=" option work again.
> 
> Fixes: bbeddf52adc1 ("printk: move braille console support into separate
> braille.[ch] files")
> Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@....org>
> ---
>  kernel/printk/braille.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/printk/braille.c b/kernel/printk/braille.c
> index 276762f3a460..f735ade8494c 100644
> --- a/kernel/printk/braille.c
> +++ b/kernel/printk/braille.c
> @@ -12,7 +12,7 @@ char *_braille_console_setup(char **str, char **brl_options)
>  	if (!memcmp(*str, "brl,", 4)) {
>  		*brl_options = "";
>  		*str += 4;
> -	} else if (!memcmp(str, "brl=", 4)) {
> +	} else if (!memcmp(*str, "brl=", 4)) {
>  		*brl_options = *str + 4;
>  		*str = strchr(*brl_options, ',');
>  		if (!*str)

Thanks.

likely the first memcmp here should be strcmp
and the second should be strncmp

That would have caused the compiler to show
the defect.