[PATCH 4.7 124/184] ath9k: fix using sta->drv_priv before initializing it

From: Greg Kroah-Hartman
Date: Thu Sep 22 2016 - 13:49:30 EST


4.7-stable review patch. If anyone has any objections, please let me know.

------------------

From: Felix Fietkau <nbd@xxxxxxxx>

commit 7711aaf08ad3fc4d0e937eec1de0a63620444ce7 upstream.

A station pointer can be passed to the driver on tx, before it has been
marked as associated. Since ath9k_sta_state was initializing the entry
too late, it resulted in some spurious crashes.

Fixes: df3c6eb34da5 ("ath9k: Use sta_state() callback")
Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/net/wireless/ath/ath9k/main.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1552,13 +1552,13 @@ static int ath9k_sta_state(struct ieee80
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
int ret = 0;

- if (old_state == IEEE80211_STA_AUTH &&
- new_state == IEEE80211_STA_ASSOC) {
+ if (old_state == IEEE80211_STA_NOTEXIST &&
+ new_state == IEEE80211_STA_NONE) {
ret = ath9k_sta_add(hw, vif, sta);
ath_dbg(common, CONFIG,
"Add station: %pM\n", sta->addr);
- } else if (old_state == IEEE80211_STA_ASSOC &&
- new_state == IEEE80211_STA_AUTH) {
+ } else if (old_state == IEEE80211_STA_NONE &&
+ new_state == IEEE80211_STA_NOTEXIST) {
ret = ath9k_sta_remove(hw, vif, sta);
ath_dbg(common, CONFIG,
"Remove station: %pM\n", sta->addr);