linux-kernel - [PATCH 3.18 49/84] mac80211: avoid using uninitialized stack data

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Message-Id: <20150107014030.599718231@linuxfoundation.org>
Date:	Tue,  6 Jan 2015 17:49:52 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Jes Sorensen <Jes.Sorensen@...hat.com>,
	Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 3.18 49/84] mac80211: avoid using uninitialized stack data

3.18-stable review patch.  If anyone has any objections, please let me know.

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

From: Jes Sorensen <Jes.Sorensen@...hat.com>

commit 7e6225a1604d0c6aa4140289bf5761868ffc9c83 upstream.

Avoid a case where we would access uninitialized stack data if the AP
advertises HT support without 40MHz channel support.

Fixes: f3000e1b43f1 ("mac80211: fix broken use of VHT/20Mhz with some APs")
Signed-off-by: Jes Sorensen <Jes.Sorensen@...hat.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/mac80211/mlme.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -174,6 +174,7 @@ ieee80211_determine_chantype(struct ieee
 	if (!(ht_cap->cap_info &
 	      cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
 		ret = IEEE80211_STA_DISABLE_40MHZ;
+		vht_chandef = *chandef;
 		goto out;
 	}
 


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