wifi: mac80211: do not pass a stopped vif to the driver in .get_txpower

commit 393b6bc upstream.

Avoid potentially crashing in the driver because of uninitialized private data

Fixes: 5b3dc42 ("mac80211: add support for driver tx power reporting")
Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://patch.msgid.link/20241002095630.22431-1-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: nbd168

net/mac80211/cfg.c

@@ -2443,7 +2443,8 @@ static int ieee80211_get_tx_power(struct wiphy *wiphy,
 	struct ieee80211_local *local = wiphy_priv(wiphy);
 	struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 
-	if (local->ops->get_txpower)
+	if (local->ops->get_txpower &&
+	    (sdata->flags & IEEE80211_SDATA_IN_DRIVER))
 		return drv_get_txpower(local, sdata, dbm);
 
 	if (!local->use_chanctx)