28 lines
882 B
Diff
28 lines
882 B
Diff
From: Michal Kazior <michal.kazior@tieto.com>
|
|
Date: Thu, 21 Jan 2016 14:23:07 +0100
|
|
Subject: [PATCH] mac80211: fix txq queue related crashes
|
|
|
|
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.
|
|
|
|
Fixes: ba8c3d6f16a1 ("mac80211: add an intermediate software queue implementation")
|
|
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
|
|
---
|
|
|
|
--- a/net/mac80211/iface.c
|
|
+++ b/net/mac80211/iface.c
|
|
@@ -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);
|
|
}
|
|
|