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mt76: mt7615: fix a possible NULL pointer dereference in mt7615_pm_wake_work 

Initialize wcid to global_wcid if msta is NULL in mt7615_pm_wake_work
routine since wcid will be dereferenced running mt76_tx()

Fixes: 2b8cdfb28d ("mt76: mt7615: wake device before pushing frames in mt7615_tx")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Lorenzo Bianconi 2020-08-21 12:09:54 +02:00 committed by Felix Fietkau
parent e862825dcf
commit a081de174d
1 changed files with 2 additions and 1 deletions
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3
drivers/net/wireless/mediatek/mt76/mt7615/mac.c
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@ -1857,12 +1857,13 @@ void mt7615_pm_wake_work(struct work_struct *work)
spin_lock_bh(&dev->pm.txq_lock);
for (i = 0; i < IEEE80211_NUM_ACS; i++) {
struct mt7615_sta *msta = dev->pm.tx_q[i].msta;
struct mt76_wcid *wcid = msta ? &msta->wcid : NULL;
struct ieee80211_sta *sta = NULL;
struct mt76_wcid *wcid;
if (!dev->pm.tx_q[i].skb)
continue;
wcid = msta ? &msta->wcid : &dev->mt76.global_wcid;
if (msta && wcid->sta)
sta = container_of((void *)msta, struct ieee80211_sta,
drv_priv);