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mwifiex: fix NULL pointer dereference in set_channel() 

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>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Amitkumar Karwar 2012-02-01 20:41:44 -08:00 committed by John W. Linville
parent 197a4e4e1f
commit 477778bb0e
1 changed files with 6 additions and 1 deletions
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7
drivers/net/wireless/mwifiex/cfg80211.c
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@ -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 "