From a081de174d11b12db9a94eb748041c2732f14c10 Mon Sep 17 00:00:00 2001
From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: Fri, 21 Aug 2020 12:09:54 +0200
Subject: [PATCH] mt76: mt7615: fix a possible NULL pointer dereference in mt7615_pm_wake_work
Git-commit: a081de174d11b12db9a94eb748041c2732f14c10
Patch-mainline: v5.10-rc1
References: git-fixes
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@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/net/wireless/mediatek/mt76/mt7615/mac.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
index e3663c7c374f..e4aeba17da67 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c
@@ -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);
--
2.16.4