linux-kernel - [PATCH 3.8 58/86] mac80211: clear sequence/fragment number in QoS-null frames

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Message-Id: <1396368519-12728-59-git-send-email-kamal@canonical.com>
Date:	Tue,  1 Apr 2014 09:08:11 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Johannes Berg <johannes.berg@...el.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.8 58/86] mac80211: clear sequence/fragment number in QoS-null frames

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

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

From: Johannes Berg <johannes.berg@...el.com>

commit 864a6040f395464003af8dd0d8ca86fed19866d4 upstream.

Avoid leaking data by sending uninitialized memory and setting an
invalid (non-zero) fragment number (the sequence number is ignored
anyway) by setting the seq_ctrl field to zero.

Fixes: 3f52b7e328c5 ("mac80211: mesh power save basics")
Fixes: ce662b44ce22 ("mac80211: send (QoS) Null if no buffered frames")
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
[ kamal: backport to 3.8 (no mesh_ps.c) ]
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 net/mac80211/sta_info.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index b6f24a7..39665d6 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -1107,6 +1107,7 @@ static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
 	memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
 	memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
 	memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
+	nullfunc->seq_ctrl = 0;
 
 	skb->priority = tid;
 	skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
-- 
1.8.3.2

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