[PATCH 1/2] mt76: fix possible NULL pointer dereferencing in mt76x2_ampdu_action()

[Lorenzo Bianconi]

Initialize mt76_txq pointer after ieee80211_txq pointer check.
Remove space after the pointer cast

Fixes: 7bc04215a66b ("mt76: add driver code for MT76x2e")
Signed-off-by: Lorenzo Bianconi <lorenzo.bianc...@redhat.com>
---
 drivers/net/wireless/mediatek/mt76/mt76x2_main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x2_main.c 
b/drivers/net/wireless/mediatek/mt76/mt76x2_main.c
index 2cef48edb275..33469e32567b 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x2_main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x2_main.c
@@ -450,13 +450,15 @@ mt76x2_ampdu_action(struct ieee80211_hw *hw, struct 
ieee80211_vif *vif,
        struct mt76x2_dev *dev = hw->priv;
        struct mt76x2_sta *msta = (struct mt76x2_sta *) sta->drv_priv;
        struct ieee80211_txq *txq = sta->txq[params->tid];
-       struct mt76_txq *mtxq = (struct mt76_txq *) txq->drv_priv;
        u16 tid = params->tid;
        u16 *ssn = &params->ssn;
+       struct mt76_txq *mtxq;
 
        if (!txq)
                return -EINVAL;
 
+       mtxq = (struct mt76_txq *)txq->drv_priv;
+
        switch (action) {
        case IEEE80211_AMPDU_RX_START:
                mt76_set(dev, MT_WCID_ADDR(msta->wcid.idx) + 4, BIT(16 + tid));
-- 
2.13.6