linux-hardening - Re: [PATCH] rtlwifi: rtl8192de: Style clean-ups

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Date:   Wed, 25 Aug 2021 19:32:55 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Pkshih <pkshih@...ltek.com>
Cc:     Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Larry Finger <Larry.Finger@...inger.net>,
        Colin Ian King <colin.king@...onical.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Joe Perches <joe@...ches.com>,
        Kaixu Xia <kaixuxia@...cent.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH] rtlwifi: rtl8192de: Style clean-ups

On Thu, Aug 26, 2021 at 12:58:13AM +0000, Pkshih wrote:
> 
> > -----Original Message-----
> > From: Kees Cook [mailto:keescook@...omium.org]
> > Sent: Thursday, August 26, 2021 2:34 AM
> > To: Pkshih
> > Cc: Kees Cook; Kalle Valo; David S. Miller; Jakub Kicinski; Larry Finger; Colin Ian King;
> > linux-wireless@...r.kernel.org; netdev@...r.kernel.org; Joe Perches; Kaixu Xia;
> > linux-kernel@...r.kernel.org; linux-hardening@...r.kernel.org
> > Subject: [PATCH] rtlwifi: rtl8192de: Style clean-ups
> > 
> > Clean up some style issues:
> > - Use ARRAY_SIZE() even though it's a u8 array.
> > - Remove redundant CHANNEL_MAX_NUMBER_2G define.
> > Additionally fix some dead code WARNs.
> > 
> > Cc: Ping-Ke Shih <pkshih@...ltek.com>
> > Cc: Kalle Valo <kvalo@...eaurora.org>
> > Cc: "David S. Miller" <davem@...emloft.net>
> > Cc: Jakub Kicinski <kuba@...nel.org>
> > Cc: Larry Finger <Larry.Finger@...inger.net>
> > Cc: Colin Ian King <colin.king@...onical.com>
> > Cc: linux-wireless@...r.kernel.org
> > Cc: netdev@...r.kernel.org
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> > ---
> >  drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c | 8 +++-----
> >  drivers/net/wireless/realtek/rtlwifi/wifi.h          | 1 -
> >  2 files changed, 3 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> > b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> > index b32fa7a75f17..9807c9e91998 100644
> > --- a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> > +++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> > @@ -899,7 +899,7 @@ static u8 _rtl92c_phy_get_rightchnlplace(u8 chnl)
> >  	u8 place = chnl;
> > 
> >  	if (chnl > 14) {
> > -		for (place = 14; place < sizeof(channel5g); place++) {
> > +		for (place = 14; place < ARRAY_SIZE(channel5g); place++) {
> 
> There are still many places we can use ARRAY_SIZE() instead of sizeof().
> Could you fix them within this file, even this driver?
> Otherwise, this patch looks good to me.

Sure! I found a couple more and have sent a v2.

-Kees

> 
> Acked-by: Ping-Ke Shih <pkshih@...ltek.com>
> 
> >  			if (channel5g[place] == chnl) {
> >  				place++;
> >  				break;
> > @@ -2861,16 +2861,14 @@ u8 rtl92d_phy_sw_chnl(struct ieee80211_hw *hw)
> >  	case BAND_ON_5G:
> >  		/* Get first channel error when change between
> >  		 * 5G and 2.4G band. */
> > -		if (channel <= 14)
> > +		if (WARN_ONCE(channel <= 14, "rtl8192de: 5G but channel<=14\n"))
> >  			return 0;
> > -		WARN_ONCE((channel <= 14), "rtl8192de: 5G but channel<=14\n");
> >  		break;
> >  	case BAND_ON_2_4G:
> >  		/* Get first channel error when change between
> >  		 * 5G and 2.4G band. */
> > -		if (channel > 14)
> > +		if (WARN_ONCE(channel > 14, "rtl8192de: 2G but channel>14\n"))
> >  			return 0;
> > -		WARN_ONCE((channel > 14), "rtl8192de: 2G but channel>14\n");
> >  		break;
> >  	default:
> >  		WARN_ONCE(true, "rtl8192de: Invalid WirelessMode(%#x)!!\n",
> > diff --git a/drivers/net/wireless/realtek/rtlwifi/wifi.h
> > b/drivers/net/wireless/realtek/rtlwifi/wifi.h
> > index aa07856411b1..31f9e9e5c680 100644
> > --- a/drivers/net/wireless/realtek/rtlwifi/wifi.h
> > +++ b/drivers/net/wireless/realtek/rtlwifi/wifi.h
> > @@ -108,7 +108,6 @@
> >  #define	CHANNEL_GROUP_IDX_5GM		6
> >  #define	CHANNEL_GROUP_IDX_5GH		9
> >  #define	CHANNEL_GROUP_MAX_5G		9
> > -#define CHANNEL_MAX_NUMBER_2G		14
> >  #define AVG_THERMAL_NUM			8
> >  #define AVG_THERMAL_NUM_88E		4
> >  #define AVG_THERMAL_NUM_8723BE		4
> > --
> > 2.30.2
> 

-- 
Kees Cook