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28 lines
882 B
Diff
28 lines
882 B
Diff
From: Michal Kazior <michal.kazior@tieto.com>
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Date: Thu, 21 Jan 2016 14:23:07 +0100
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Subject: [PATCH] mac80211: fix txq queue related crashes
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The driver can access the queue simultanously
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while mac80211 tears down the interface. Without
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spinlock protection this could lead to corrupting
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sk_buff_head and subsequently to an invalid
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pointer dereference.
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Fixes: ba8c3d6f16a1 ("mac80211: add an intermediate software queue implementation")
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Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
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---
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--- a/net/mac80211/iface.c
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+++ b/net/mac80211/iface.c
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@@ -977,7 +977,10 @@ static void ieee80211_do_stop(struct iee
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if (sdata->vif.txq) {
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struct txq_info *txqi = to_txq_info(sdata->vif.txq);
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+ spin_lock_bh(&txqi->queue.lock);
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ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
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+ spin_unlock_bh(&txqi->queue.lock);
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+
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atomic_set(&sdata->txqs_len[txqi->txq.ac], 0);
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}
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