linux-kernel - Re: [PATCH] kernel/debug/kdb/kdb

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Message-ID: <20140722075207.GN25880@mwanda>
Date:	Tue, 22 Jul 2014 10:53:13 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Andrey Utkin <andrey.krieger.utkin@...il.com>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	kgdb-bugreport@...ts.sourceforge.net, dcb314@...mail.com,
	jason.wessel@...driver.com, wharms@....de
Subject: Re: [PATCH] kernel/debug/kdb/kdb_bp.c: fix argument range check

On Fri, Jul 18, 2014 at 08:40:24PM +0300, Andrey Utkin wrote:
> Dropped negativity check; enhanced upper limit check as proposed by
> Walter Harms <wharms@....de>
> 
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=80591
> Reported-by: David Binderman <dcb314@...mail.com>
> Signed-off-by: Andrey Utkin <andrey.krieger.utkin@...il.com>
> ---
>  kernel/debug/kdb/kdb_bp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/debug/kdb/kdb_bp.c b/kernel/debug/kdb/kdb_bp.c
> index 70a5046..371150f 100644
> --- a/kernel/debug/kdb/kdb_bp.c
> +++ b/kernel/debug/kdb/kdb_bp.c
> @@ -39,7 +39,7 @@ static char *kdb_rwtypes[] = {
>  
>  static char *kdb_bptype(kdb_bp_t *bp)
>  {
> -	if (bp->bp_type < 0 || bp->bp_type > 4)
> +	if (bp->bp_type >= ARRAY_SIZE(kdb_rwtypes))
>  		return "";

I like this version of the patch because it silences the static checker
warning like the first one does but it also makes the code more
readable.

regards,
dan carpenter

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