mt76: fix possible NULL pointer dereference in mt76_tx

Even if this is not a real issue since mt76_tx is never run with wcid set
to NULL, fix a theoretical NULL pointer dereference in mt76_tx routine

Fixes: db9f11d3433f7 ("mt76: store wcid tx rate info in one u32 reduce locking")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/drivers/net/wireless/mediatek/mt76/tx.c b/drivers/net/wireless/mediatek/mt76/tx.c
index 70a8301..5cc3e4d 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/tx.c
+++ b/drivers/net/wireless/mediatek/mt76/tx.c
@@ -306,7 +306,7 @@ mt76_tx(struct mt76_phy *phy, struct ieee80211_sta *sta,
                skb_set_queue_mapping(skb, qid);
        }
 
-       if (!(wcid->tx_info & MT_WCID_TX_INFO_SET))
+       if (wcid && !(wcid->tx_info & MT_WCID_TX_INFO_SET))
                ieee80211_get_tx_rates(info->control.vif, sta, skb,
                                       info->control.rates, 1);