This is a note to let you know that I've just added the patch titled
mt76: mt7615: fix a possible NULL pointer dereference in mt7615_pm_wake_work
to the 5.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mt76-mt7615-fix-a-possible-null-pointer-dereference-.patch
and it can be found in the queue-5.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b58ce37d6b51ccc159548e389d86a7b71163ed09
Author: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
Date: Fri Aug 21 12:09:54 2020 +0200
mt76: mt7615: fix a possible NULL pointer dereference in mt7615_pm_wake_work
[ Upstream commit a081de174d11b12db9a94eb748041c2732f14c10 ]
Initialize wcid to global_wcid if msta is NULL in mt7615_pm_wake_work
routine since wcid will be dereferenced running mt76_tx()
Fixes: 2b8cdfb28d340 ("mt76: mt7615: wake device before pushing frames in mt7615_tx")
Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
index 3dd8dd28690ed..2be127018df6a 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
@@ -1853,12 +1853,13 @@ 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);
