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mt76: fix potential NULL pointer dereference in mt76_stop_tx_queues

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Starting from mac80211 commit adf8ed01e4 ("mac80211: add an optional
TXQ for other PS-buffered frames") and commit 0eeb2b674f ("mac80211:
add an option for station management TXQ") a new per-sta queue has been
introduced for bufferable management frames.
sta->txq[IEEE80211_NUM_TIDS] is initialized just if the driver reports
the following hw flags:
- IEEE80211_HW_STA_MMPDU_TXQ
- IEEE80211_HW_BUFF_MMPDU_TXQ
This can produce a NULL pointer dereference in mt76_stop_tx_queues
since mt76 iterates on all available sta tx queues assuming they are
initialized by mac80211. This issue has been spotted analyzing the code
(it has not triggered any crash yet)

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Lorenzo Bianconi 2018-11-16 17:19:21 +01:00 committed by Kalle Valo
parent 1aa48f0886
commit 7c250f4612
1 changed files with 6 additions and 1 deletions
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7
drivers/net/wireless/mediatek/mt76/tx.c
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@ -400,7 +400,12 @@ void mt76_stop_tx_queues(struct mt76_dev *dev, struct ieee80211_sta *sta,
for (i = 0; i < ARRAY_SIZE(sta->txq); i++) {
struct ieee80211_txq *txq = sta->txq[i];
struct mt76_txq *mtxq = (struct mt76_txq *) txq->drv_priv;
struct mt76_txq *mtxq;
if (!txq)
continue;
mtxq = (struct mt76_txq *)txq->drv_priv;
spin_lock_bh(&mtxq->hwq->lock);
mtxq->send_bar = mtxq->aggr && send_bar;