[PATCH] mwifiex: fix NULL pointer dereference in set_channel()

[Bing Zhao <bzhao@marvell.com>]

From: Amitkumar Karwar <akarwar@marvell.com>

In set_channel() callback handler, "priv" pointer is derived from
net_device. Sometimes net_device pointer coming from the stack
is NULL which causes kernel crash.
This patch fixes the problem by deriving "priv" from wiphy
when net_device pointer is NULL.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
---
 drivers/net/wireless/mwifiex/cfg80211.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/net/wireless/mwifiex/cfg80211.c b/drivers/net/wireless/mwifiex/cfg80211.c
index 6fef492..54e45c8 100644
--- a/drivers/net/wireless/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/mwifiex/cfg80211.c
@@ -376,7 +376,12 @@ mwifiex_cfg80211_set_channel(struct wiphy *wiphy, struct net_device *dev,
 			     struct ieee80211_channel *chan,
 			     enum nl80211_channel_type channel_type)
 {
-	struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
+	struct mwifiex_private *priv;
+
+	if (dev)
+		priv = mwifiex_netdev_get_priv(dev);
+	else
+		priv = mwifiex_cfg80211_get_priv(wiphy);
 
 	if (priv->media_connected) {
 		wiphy_err(wiphy, "This setting is valid only when station "
-- 
1.7.0.2