mac80211: fix race condition caused by late addBA response

Upstream commit d305a6557b2c4dca0110f05ffe745b1ef94adb80.

If addBA responses comes in just after addba_resp_timer has
expired mac80211 will still accept it and try to open the
aggregation session. This causes drivers to be confused and
in some cases even crash.

This patch fixes the race condition and makes sure that if
addba_resp_timer has expired addBA response is not longer
accepted and we do not try to open half-closed session.

Signed-off-by: Nikolay Martynov <mar.kolya@gmail.com>
[some adjustments]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c
index 42a59c2..db7db43 100644 (file)
--- a/net/mac80211/agg-tx.c
+++ b/net/mac80211/agg-tx.c
@@ -792,12 +792,27 @@ void ieee80211_process_addba_resp(struct ieee80211_local *local,
                goto out;
        }
 
-       del_timer(&tid_tx->addba_resp_timer);
+       del_timer_sync(&tid_tx->addba_resp_timer);
 
 #ifdef CONFIG_MAC80211_HT_DEBUG
        printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid);
 #endif
 
+       /*
+        * addba_resp_timer may have fired before we got here, and
+        * caused WANT_STOP to be set. If the stop then was already
+        * processed further, STOPPING might be set.
+        */
+       if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) ||
+           test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
+#ifdef CONFIG_MAC80211_HT_DEBUG
+               printk(KERN_DEBUG
+                      "got addBA resp for tid %d but we already gave up\n",
+                      tid);
+#endif
+               goto out;
+       }
+
        if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
                        == WLAN_STATUS_SUCCESS) {
                /*