4.19-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 7c250f4612ae97aa04500c0d0cff69bb87046e3a ]
Starting from mac80211 commit adf8ed01e4fd ("mac80211: add an optional TXQ for other PS-buffered frames") and commit 0eeb2b674f05 ("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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/mediatek/mt76/tx.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/mediatek/mt76/tx.c b/drivers/net/wireless/mediatek/mt76/tx.c index af48d43bb7dc..20447fdce4c3 100644 --- a/drivers/net/wireless/mediatek/mt76/tx.c +++ b/drivers/net/wireless/mediatek/mt76/tx.c @@ -385,7 +385,12 @@ 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;