mac80211: do not pass a stopped vif to the driver on get_txpower

Fixes potential crashes in various drivers when checking the status of
interfaces that are down

Signed-off-by: Felix Fietkau <[email protected]>

package/kernel/mac80211/patches/subsys/321-wifi-mac80211-do-not-pass-a-stopped-vif-to-the-drive.patch

@@ -0,0 +1,24 @@
+From: Felix Fietkau <[email protected]>
+Date: Wed, 2 Oct 2024 11:45:35 +0200
+Subject: [PATCH] wifi: mac80211: do not pass a stopped vif to the driver in
+ .get_txpower
+
+Avoid potentially crashing in the driver because of uninitialized private data
+
+Fixes: 5b3dc42b1b0d ("mac80211: add support for driver tx power reporting")
+Cc: [email protected]
+Signed-off-by: Felix Fietkau <[email protected]>
+---
+
+--- a/net/mac80211/cfg.c
++++ b/net/mac80211/cfg.c
+@@ -3134,7 +3134,8 @@ static int ieee80211_get_tx_power(struct
+ 	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->emulate_chanctx)