linux-kernel - Re: Added Realtek rtl8192u driver to staging

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Message-ID: <20190822080848.GF4451@kadam>
Date:   Thu, 22 Aug 2019 11:08:48 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Colin Ian King <colin.king@...onical.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jerry Chuang <jerry-chuang@...ltek.com>,
        John Whitmore <johnfwhitmore@...il.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: Added Realtek rtl8192u driver to staging - static analysis
 report.

On Wed, Aug 21, 2019 at 07:18:39PM +0100, Colin Ian King wrote:
> Hi,
> 
> Static analysis of linux-next picked up an issue with the following commit:
> 
> commit 8fc8598e61f6f384f3eaf1d9b09500c12af47b37
> Author: Jerry Chuang <jerry-chuang@...ltek.com>
> Date:   Tue Nov 3 07:17:11 2009 -0200
> 
>     Staging: Added Realtek rtl8192u driver to staging
> 
> In drivers/staging/rtl8192u/ieee80211/ieee80211_softmac.c we have:
> 
> CID 48331 (#1 of 1): Unused value (UNUSED_VALUE) assigned_pointer
> 
> Assigning value from ieee->crypt[ieee->tx_keyidx] to crypt here, but
> that stored value is not used.
> 
> 746        crypt = ieee->crypt[ieee->tx_keyidx];
> 747        if (encrypt)
> 748                beacon_buf->capability |=
> cpu_to_le16(WLAN_CAPABILITY_PRIVACY);

Earlir in the function we have:

   695          crypt = ieee->crypt[ieee->tx_keyidx];
   696  
   697          encrypt = ieee->host_encrypt && crypt && crypt->ops &&
   698                  ((0 == strcmp(crypt->ops->name, "WEP") || wpa_ie_len));
   699          /* HT ralated element */

So the "crypt" assignment is dublicate and should definitely be removed.
The "if (encrypt) " check looks correct and it sort of matches what we
do in ieee80211_assoc_resp().

   840          encrypt = crypt && crypt->ops;
   841  
   842          if (encrypt)
   843                  assoc->capability |= cpu_to_le16(WLAN_CAPABILITY_PRIVACY);
   844  

So let's leave it as-is, just delete the crypt assignment.  If you want,
you can send this patch and I can give you a Reviewed-by tag or if you
want I can send the patch and give you Reported-by credit.

regards,
dan carpenter