linux-kernel - [84/98] mac80211: check that ieee80211_set_power

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Date:	Tue, 26 Jan 2010 15:34:50 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Benoit Papillault <benoit.papillault@...e.fr>,
	"John W. Linville" <linville@...driver.com>
Subject: [84/98] mac80211: check that ieee80211_set_power_mgmt only handles STA interfaces.

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Benoit Papillault <benoit.papillault@...e.fr>

commit e5de30c9bf4a39db9f54c4a373470ce65881ade0 upstream.

ieee80211_set_power_mgmt is meant for STA interfaces only. Moreover,
since sdata->u.mgd.mtx is only initialized for STA interfaces, using
this code for any other type of interface (like creating a monitor
interface) will result in a oops.

Signed-off-by: Benoit Papillault <benoit.papillault@...e.fr>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/mac80211/cfg.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1306,6 +1306,9 @@ static int ieee80211_set_power_mgmt(stru
 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 	struct ieee80211_conf *conf = &local->hw.conf;
 
+	if (sdata->vif.type != NL80211_IFTYPE_STATION)
+		return -EOPNOTSUPP;
+
 	if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS))
 		return -EOPNOTSUPP;
 


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