mac80211: add more missing checks for VHT tx rates

Fixes a crash on attempting to calculate the frame duration for a VHT
packet (which needs to be handled by hw/driver instead).
Reported-by: NJouni Malinen <j@w1.fi>
Signed-off-by: NFelix Fietkau <nbd@openwrt.org>
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>

net/mac80211/rate.c

@@ -446,7 +446,8 @@ static void rate_fixup_ratelist(struct ieee80211_vif *vif,
 	 *
 	 * XXX: Should this check all retry rates?
 	 */
-	if (!(rates[0].flags & IEEE80211_TX_RC_MCS)) {
+	if (!(rates[0].flags &
+	      (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) {
 		u32 basic_rates = vif->bss_conf.basic_rates;
 		s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0;
 

net/mac80211/tx.c

@@ -60,7 +60,7 @@ static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
 	rcu_read_unlock();
 
 	/* assume HW handles this */
-	if (tx->rate.flags & IEEE80211_TX_RC_MCS)
+	if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
 		return 0;
 
 	/* uh huh? */