ath9k: fix key allocation error handling for powersave keys

If no keycache slots are available, ath_key_config can return -ENOSPC.
If the key index is not checked for errors, it can lead to logspam that
looks like this: "ath: wiphy0: keyreset: keycache entry 228 out of range"
This can cause follow-up errors if the invalid keycache index gets
used for tx.

Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 6963862..c4fc3d1 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1332,6 +1332,7 @@ static int ath9k_sta_add(struct ieee80211_hw *hw,
        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
        struct ath_node *an = (struct ath_node *) sta->drv_priv;
        struct ieee80211_key_conf ps_key = { };
+       int key;
 
        ath_node_attach(sc, sta, vif);
 
@@ -1339,7 +1340,9 @@ static int ath9k_sta_add(struct ieee80211_hw *hw,
            vif->type != NL80211_IFTYPE_AP_VLAN)
                return 0;
 
-       an->ps_key = ath_key_config(common, vif, sta, &ps_key);
+       key = ath_key_config(common, vif, sta, &ps_key);
+       if (key > 0)
+               an->ps_key = key;
 
        return 0;
 }
@@ -1356,6 +1359,7 @@ static void ath9k_del_ps_key(struct ath_softc *sc,
            return;
 
        ath_key_delete(common, &ps_key);
+       an->ps_key = 0;
 }
 
 static int ath9k_sta_remove(struct ieee80211_hw *hw,