linux-kernel - [PATCH] staging: wlan-ng: Fix dereference before NULL check

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Message-Id: <1347984247-9226-1-git-send-email-emilgoode@gmail.com>
Date:	Tue, 18 Sep 2012 18:04:07 +0200
From:	Emil Goode <emilgoode@...il.com>
To:	gregkh@...uxfoundation.org, dan.carpenter@...cle.com,
	krzysztof.wilczynski@...ux.com, devendra.aaru@...il.com
Cc:	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org, Emil Goode <emilgoode@...il.com>
Subject: [PATCH] staging: wlan-ng: Fix dereference before NULL check

Smatch is warning about a dereference before we check for NULL.
This patch moves the dereference to after the NULL check.

Smatch warning:
drivers/staging/wlan-ng/cfg80211.c:345 prism2_scan() warn:
	variable dereferenced before check 'request' (see line 332)

Signed-off-by: Emil Goode <emilgoode@...il.com>
---
Introduced by my commit 01f8a27e

 drivers/staging/wlan-ng/cfg80211.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/wlan-ng/cfg80211.c b/drivers/staging/wlan-ng/cfg80211.c
index 0970127..57a2b05 100644
--- a/drivers/staging/wlan-ng/cfg80211.c
+++ b/drivers/staging/wlan-ng/cfg80211.c
@@ -329,9 +329,9 @@ int prism2_get_station(struct wiphy *wiphy, struct net_device *dev,
 
 int prism2_scan(struct wiphy *wiphy, struct cfg80211_scan_request *request)
 {
-	struct net_device *dev = request->wdev->netdev;
+	struct net_device *dev;
 	struct prism2_wiphy_private *priv = wiphy_priv(wiphy);
-	wlandevice_t *wlandev = dev->ml_priv;
+	wlandevice_t *wlandev;
 	struct p80211msg_dot11req_scan msg1;
 	struct p80211msg_dot11req_scan_results msg2;
 	struct cfg80211_bss *bss;
@@ -345,6 +345,9 @@ int prism2_scan(struct wiphy *wiphy, struct cfg80211_scan_request *request)
 	if (!request)
 		return -EINVAL;
 
+	dev = request->wdev->netdev;
+	wlandev = dev->ml_priv;
+
 	if (priv->scan_request && priv->scan_request != request)
 		return -EBUSY;
 
-- 
1.7.10.4

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