Patch "mac80211: fix txq queue related crashes" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

mac80211: fix txq queue related crashes

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
mac80211-fix-txq-queue-related-crashes.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Michal Kazior <[email protected]>
Date: Thu, 21 Jan 2016 14:23:07 +0100
Subject: mac80211: fix txq queue related crashes

From: Michal Kazior <[email protected]>

commit 2a58d42c1e018ad514d4e23fd33fb2ded95d3ee6 upstream.

The driver can access the queue simultanously
while mac80211 tears down the interface. Without
spinlock protection this could lead to corrupting
sk_buff_head and subsequently to an invalid
pointer dereference.

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

@@ -977,7 +977,10 @@ static void ieee80211_do_stop(struct iee
 	if (sdata->vif.txq) {
 		struct txq_info *txqi = to_txq_info(sdata->vif.txq);
 
+		spin_lock_bh(&txqi->queue.lock);
 		ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
+		spin_unlock_bh(&txqi->queue.lock);
+
 		atomic_set(&sdata->txqs_len[txqi->txq.ac], 0);
 	}
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/mac80211-fix-unnecessary-frame-drops-in-mesh-fwding.patch queue-4.4/mac80211-fix-txq-queue-related-crashes.patch