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Date:   Wed, 25 Aug 2021 19:36:02 -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>,
        Kaixu Xia <kaixuxia@...cent.com>,
        Joe Perches <joe@...ches.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "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: Restore channel index initialization

On Thu, Aug 26, 2021 at 12:45:53AM +0000, Pkshih wrote:
> 
> 
> > -----Original Message-----
> > From: Kees Cook [mailto:keescook@...omium.org]
> > Sent: Thursday, August 26, 2021 2:31 AM
> > To: Pkshih
> > Cc: Kees Cook; Kalle Valo; David S. Miller; Jakub Kicinski; Larry Finger; Colin Ian King; Kaixu Xia;
> > Joe Perches; linux-wireless@...r.kernel.org; netdev@...r.kernel.org; linux-kernel@...r.kernel.org;
> > linux-hardening@...r.kernel.org
> > Subject: [PATCH] rtlwifi: rtl8192de: Restore channel index initialization
> > 
> > 2G channel indexes still need "place" to be initialized, since it is
> > returned from this function when channel is less than 14.
> > 
> > Fixes: 369956ae5720 ("rtlwifi: rtl8192de: Remove redundant variable initializations")
> 
> Like the patch "rtlwifi: rtl8192de: Fix initialization of place in _rtl92c_phy_get_rightchnlplace()"
> you sent before, please help to correct the removal of the commit 369956ae5720.
> I think we can add following into this patch.
> 
> --- a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> @@ -1363,7 +1363,7 @@ static void _rtl92d_phy_switch_rf_setting(struct ieee80211_hw *hw, u8 channel)
> 
>  u8 rtl92d_get_rightchnlplace_for_iqk(u8 chnl)
>  {
> -       u8 place = chnl;
> +       u8 place;
> 
>         if (chnl > 14) {
>                 for (place = 14; place < sizeof(channel_all); place++) {

Oh, er, it looks like Nathan found this before me, yes. I think
https://lore.kernel.org/linux-wireless/20210823222014.764557-1-nathan@kernel.org/
is the complete patch.

-Kees

> 
> > 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: Kaixu Xia <kaixuxia@...cent.com>
> > Cc: Joe Perches <joe@...ches.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 | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> > b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> > index 8ae69d914312..b32fa7a75f17 100644
> > --- a/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> > +++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192de/phy.c
> > @@ -896,7 +896,7 @@ static void _rtl92d_ccxpower_index_check(struct ieee80211_hw *hw,
> > 
> >  static u8 _rtl92c_phy_get_rightchnlplace(u8 chnl)
> >  {
> > -	u8 place;
> > +	u8 place = chnl;
> > 
> >  	if (chnl > 14) {
> >  		for (place = 14; place < sizeof(channel5g); place++) {
> 
> --
> Ping-Ke
> 

-- 
Kees Cook

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