Re: [PATCH] kernel/debug/kdb/kdb_bp.c: fix argument range check

[Dan Carpenter <dan.carpenter@oracle.com>]

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@bfs.de>
> 
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=80591
> Reported-by: David Binderman <dcb314@hotmail.com>
> Signed-off-by: Andrey Utkin <andrey.krieger.utkin@gmail.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