netdev - [PATCH 12/22] staging: rtl8723bs: Fix possible usage of NULL pointer in core/rtw

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Message-Id: <20170408160745.14328-13-Larry.Finger@lwfinger.net>
Date:   Sat,  8 Apr 2017 11:07:35 -0500
From:   Larry Finger <Larry.Finger@...inger.net>
To:     gregkh@...uxfoundation.org
Cc:     netdev@...r.kernel.org, devel@...verdev.osuosl.org,
        hdegoede@...hat.com, hadess@...ess.net, jes.sorensen@...il.com,
        Larry Finger <Larry.Finger@...inger.net>
Subject: [PATCH 12/22] staging: rtl8723bs: Fix possible usage of NULL pointer in core/rtw_debug.c

Smatch reports the following:

  CHECK   drivers/staging/rtl8723bs/core/rtw_debug.c
drivers/staging/rtl8723bs/core/rtw_debug.c:454 proc_get_survey_info() error: we previously assumed 'phead' could be null (see line 453)
drivers/staging/rtl8723bs/core/rtw_debug.c:455 proc_get_survey_info() warn: variable dereferenced before check 'phead' (see line 454)

In the code, there are two successive calls to get_head(). The second
is removed.

Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
---
 drivers/staging/rtl8723bs/core/rtw_debug.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/staging/rtl8723bs/core/rtw_debug.c b/drivers/staging/rtl8723bs/core/rtw_debug.c
index d34747b29309..51cef55d3f76 100644
--- a/drivers/staging/rtl8723bs/core/rtw_debug.c
+++ b/drivers/staging/rtl8723bs/core/rtw_debug.c
@@ -451,7 +451,6 @@ int proc_get_survey_info(struct seq_file *m, void *v)
 	spin_lock_bh(&(pmlmepriv->scanned_queue.lock));
 	phead = get_list_head(queue);
 	plist = phead ? get_next(phead) : NULL;
-	plist = get_next(phead);
 	if ((!phead) || (!plist)) {
 		spin_unlock_bh(&(pmlmepriv->scanned_queue.lock));
 		return 0;
-- 
2.12.0