iwlwifi: mvm: check if mac80211_queue is valid in iwl_mvm_disable_txq

Sometimes iwl_mvm_disable_txq() may be called with mac80211_queue ==
IEEE80211_INVAL_HW_QUEUE, and this would cause us to use BIT(0xFF)
which is way too large for the u16 we used to store it in
hw_queue_to_mac820211.  If this happens the following UBSAN warning
will be generated:

[  167.185167] UBSAN: Undefined behaviour in drivers/net/wireless/intel/iwlwifi/mvm/utils.c:838:5
[  167.185171] shift exponent 255 is too large for 64-bit type 'long unsigned int'

Fix that by checking that it is not IEEE80211_INVAL_HW_QUEUE and,
while at it, add a warning if the queue number is larger than
IEEE80211_MAX_QUEUES.

Fixes: 34e10860 ("iwlwifi: mvm: remove references to queue_info in new TX path")
Reported-by: Paul Menzel <pmenzel+linux-wireless@molgen.mpg.de>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/utils.c

@@ -800,12 +800,19 @@ int iwl_mvm_disable_txq(struct iwl_mvm *mvm, int queue, int mac80211_queue,
 		.scd_queue = queue,
 		.action = SCD_CFG_DISABLE_QUEUE,
 	};
-	bool remove_mac_queue = true;
+	bool remove_mac_queue = mac80211_queue != IEEE80211_INVAL_HW_QUEUE;
 	int ret;
 
+	if (WARN_ON(remove_mac_queue && mac80211_queue >= IEEE80211_MAX_QUEUES))
+		return -EINVAL;
+
 	if (iwl_mvm_has_new_tx_api(mvm)) {
 		spin_lock_bh(&mvm->queue_info_lock);
-		mvm->hw_queue_to_mac80211[queue] &= ~BIT(mac80211_queue);
+
+		if (remove_mac_queue)
+			mvm->hw_queue_to_mac80211[queue] &=
+				~BIT(mac80211_queue);
+
 		spin_unlock_bh(&mvm->queue_info_lock);
 
 		iwl_trans_txq_free(mvm->trans, queue);