linux-kernel - Re: [PATCH 1/7] tty/vt: consolemap: use ARRAY

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Message-ID: <68107f11-58bb-5c55-8f45-891717d08d33@linux.intel.com>
Date:   Tue, 14 Jun 2022 11:17:24 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Jiri Slaby <jslaby@...e.cz>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-serial <linux-serial@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/7] tty/vt: consolemap: use ARRAY_SIZE(), part II.

On Tue, 14 Jun 2022, Jiri Slaby wrote:

> The code still uses constants (macros) as bounds in loops after commit
> 17945d317a52 (tty/vt: consolemap: use ARRAY_SIZE()). The contants are at
> least macros used also in the definition of the arrays. But use
> ARRAY_SIZE() on two more places to ensure the loops never run out of
> bounds even if the array definition change.
> 
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> ---
>  drivers/tty/vt/consolemap.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/tty/vt/consolemap.c b/drivers/tty/vt/consolemap.c
> index fff97ae87e00..8aa7a48b3647 100644
> --- a/drivers/tty/vt/consolemap.c
> +++ b/drivers/tty/vt/consolemap.c
> @@ -232,7 +232,7 @@ static void set_inverse_transl(struct vc_data *conp, struct uni_pagedict *p,
>  	}
>  	memset(q, 0, MAX_GLYPH);
>  
> -	for (j = 0; j < E_TABSZ; j++) {
> +	for (j = 0; j < ARRAY_SIZE(translations[i]); j++) {

Any particular reason why you left its definition to have 256 instead of 
E_TABSZ (even after the patch series I mean):

static unsigned short translations[][256] = {


>  		glyph = conv_uni_to_pc(conp, t[j]);
>  		if (glyph >= 0 && glyph < MAX_GLYPH && q[glyph] < 32) {
>  			/* prefer '-' above SHY etc. */
> @@ -367,7 +367,7 @@ int con_get_trans_old(unsigned char __user * arg)
>  	unsigned char outbuf[E_TABSZ];
>  
>  	console_lock();
> -	for (i = 0; i < E_TABSZ ; i++)
> +	for (i = 0; i < ARRAY_SIZE(outbuf); i++)
>  	{
>  		ch = conv_uni_to_pc(vc_cons[fg_console].d, p[i]);
>  		outbuf[i] = (ch & ~0xff) ? 0 : ch;
> 

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

-- 
 i.