linux-staging.lists.linux.dev archive mirror
 help / color / mirror / Atom feed
From: Colin Ian King <colin.king@canonical.com>
To: Quytelda Kahja <quytelda@tamalin.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"linux-staging@lists.linux.dev" <linux-staging@lists.linux.dev>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: staging: rtl8723bs mask values in wpa_set_auth_algs
Date: Fri, 9 Jul 2021 15:53:39 +0100	[thread overview]
Message-ID: <619462ca-e652-30f5-6ffa-3213175d8bbc@canonical.com> (raw)

Hi,

Static analysis with Coverity has found an issue introduced by the
following commit:

commit 5befa937e8daaebcde81b9423eb93f3ff2e918f7
Author: Quytelda Kahja <quytelda@tamalin.org>
Date:   Tue Mar 27 01:41:02 2018 -0700

    staging: rtl8723bs: Fix IEEE80211 authentication algorithm constants.

The analysis is as follows:

347 static int wpa_set_auth_algs(struct net_device *dev, u32 value)
348 {
349        struct adapter *padapter = rtw_netdev_priv(dev);
350        int ret = 0;
351
352        if ((value & WLAN_AUTH_SHARED_KEY) && (value & WLAN_AUTH_OPEN)) {

Logically dead code (DEADCODE)

353                padapter->securitypriv.ndisencryptstatus =
Ndis802_11Encryption1Enabled;
354                padapter->securitypriv.ndisauthtype =
Ndis802_11AuthModeAutoSwitch;
355                padapter->securitypriv.dot11AuthAlgrthm =
dot11AuthAlgrthm_Auto;
356        } else if (value & WLAN_AUTH_SHARED_KEY)        {
357                padapter->securitypriv.ndisencryptstatus =
Ndis802_11Encryption1Enabled;
358
359                padapter->securitypriv.ndisauthtype =
Ndis802_11AuthModeShared;
360                padapter->securitypriv.dot11AuthAlgrthm =
dot11AuthAlgrthm_Shared;
   dead_error_condition: The condition value & 0U cannot be true.
361        } else if (value & WLAN_AUTH_OPEN) {
362                /* padapter->securitypriv.ndisencryptstatus =
Ndis802_11EncryptionDisabled; */

Logically dead code (DEADCODE)

363                if (padapter->securitypriv.ndisauthtype <
Ndis802_11AuthModeWPAPSK) {
364                        padapter->securitypriv.ndisauthtype =
Ndis802_11AuthModeOpen;
365                        padapter->securitypriv.dot11AuthAlgrthm =
dot11AuthAlgrthm_Open;
366                }
367        } else {
368                ret = -EINVAL;
369        }
370
371        return ret;
372
373 }

The deadcode warnings occur because the mask value of WLAN_AUTH_OPEN is
defined in /include/linux/ieee80211.h as:

#define WLAN_AUTO_OPEN 0

and so any value masked with 0 is 0 and hence that part of the if
statement is always false.

The original code was using the mask values:

AUTH_ALG_SHARED_KEY and also AUTH_ALG_OPEN_SYSTEM that are defined as:

#define AUTH_ALG_OPEN_SYSTEM                   0x1
#define AUTH_ALG_SHARED_KEY                    0x2

So this appears to be a regression. I'm not sure the best approach for a
suitable fix to use the intended macros in ieee80211.h

Colin




             reply	other threads:[~2021-07-09 14:59 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-09 14:53 Colin Ian King [this message]
2021-07-15 10:08 ` Fabio Aiuto
2021-07-15 14:57 ` [PATCH] staging: rtl8723bs: fix wpa_set_auth_algs() function Fabio Aiuto

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=619462ca-e652-30f5-6ffa-3213175d8bbc@canonical.com \
    --to=colin.king@canonical.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-staging@lists.linux.dev \
    --cc=quytelda@tamalin.org \
    --subject='Re: staging: rtl8723bs mask values in wpa_set_auth_algs' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
on how to clone and mirror all data and code used for this inbox