Merge branch 'security' of git://git.kernel.org/pub/scm/linux/kernel/git/linville...

* 'security' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6:
  mac80211: fix spurious delBA handling
  mac80211: fix two remote exploits

diff --git a/drivers/net/wireless/iwlwifi/iwl-tx.c b/drivers/net/wireless/iwlwifi/iwl-tx.c
index fb9bcfa6d9471e057bac4a2d7e98237c451c03e0..b7e196e3c8d37e1671171e2cacecf86a99306dcc 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-tx.c
@@ -1277,8 +1277,16 @@ int iwl_tx_agg_stop(struct iwl_priv *priv , const u8 *ra, u16 tid)
                return -ENXIO;
        }
 
+       if (priv->stations[sta_id].tid[tid].agg.state ==
+                               IWL_EMPTYING_HW_QUEUE_ADDBA) {
+               IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
+               ieee80211_stop_tx_ba_cb_irqsafe(priv->hw, ra, tid);
+               priv->stations[sta_id].tid[tid].agg.state = IWL_AGG_OFF;
+               return 0;
+       }
+
        if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_ON)
-               IWL_WARN(priv, "Stopping AGG while state not IWL_AGG_ON\n");
+               IWL_WARN(priv, "Stopping AGG while state not ON or starting\n");
 
        tid_data = &priv->stations[sta_id].tid[tid];
        ssn = (tid_data->seq_number & IEEE80211_SCTL_SEQ) >> 4;

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index c75b960c8ac8e0e954c400f43c4c163cc360caea..998c30fc89819f2d48140dd83ad82feb40e6f99b 100644 (file)
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1283,6 +1283,12 @@ enum ieee80211_filter_flags {
  *
  * These flags are used with the ampdu_action() callback in
  * &struct ieee80211_ops to indicate which action is needed.
+ *
+ * Note that drivers MUST be able to deal with a TX aggregation
+ * session being stopped even before they OK'ed starting it by
+ * calling ieee80211_start_tx_ba_cb(_irqsafe), because the peer
+ * might receive the addBA frame and send a delBA right away!
+ *
  * @IEEE80211_AMPDU_RX_START: start Rx aggregation
  * @IEEE80211_AMPDU_RX_STOP: stop Rx aggregation
  * @IEEE80211_AMPDU_TX_START: start Tx aggregation

diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c
index bc064d7933ff692e2728bfc68c81ded152c930c1..ce8e0e772bab773cd131ea7077a1be79af96695d 100644 (file)
--- a/net/mac80211/agg-rx.c
+++ b/net/mac80211/agg-rx.c
@@ -85,10 +85,6 @@ void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *r
        struct ieee80211_local *local = sdata->local;
        struct sta_info *sta;
 
-       /* stop HW Rx aggregation. ampdu_action existence
-        * already verified in session init so we add the BUG_ON */
-       BUG_ON(!local->ops->ampdu_action);
-
        rcu_read_lock();
 
        sta = sta_info_get(local, ra);

diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c
index 206fd82f0c7698b4b2c08d38df10c50c89657c7c..89e238b001de936e4585f2eae73b3d09ae8cb3f7 100644 (file)
--- a/net/mac80211/agg-tx.c
+++ b/net/mac80211/agg-tx.c
@@ -123,13 +123,18 @@ void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u1
        ieee80211_tx_skb(sdata, skb, 0);
 }
 
-static int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
-                                          enum ieee80211_back_parties initiator)
+int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
+                                   enum ieee80211_back_parties initiator)
 {
        struct ieee80211_local *local = sta->local;
        int ret;
        u8 *state;
 
+#ifdef CONFIG_MAC80211_HT_DEBUG
+       printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
+              sta->sta.addr, tid);
+#endif /* CONFIG_MAC80211_HT_DEBUG */
+
        state = &sta->ampdu_mlme.tid_state_tx[tid];
 
        if (*state == HT_AGG_STATE_OPERATIONAL)
@@ -143,7 +148,6 @@ static int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
 
        /* HW shall not deny going back to legacy */
        if (WARN_ON(ret)) {
-               *state = HT_AGG_STATE_OPERATIONAL;
                /*
                 * We may have pending packets get stuck in this case...
                 * Not bothering with a workaround for now.
@@ -525,11 +529,6 @@ int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
                goto unlock;
        }
 
-#ifdef CONFIG_MAC80211_HT_DEBUG
-       printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
-              sta->sta.addr, tid);
-#endif /* CONFIG_MAC80211_HT_DEBUG */
-
        ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator);
 
  unlock:
@@ -545,7 +544,7 @@ int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
        struct sta_info *sta;
        int ret = 0;
 
-       if (WARN_ON(!local->ops->ampdu_action))
+       if (!local->ops->ampdu_action)
                return -EINVAL;
 
        if (tid >= STA_TID_NUM)

diff --git a/net/mac80211/ht.c b/net/mac80211/ht.c
index 48ef1a282b91b8f1cf0bf9c3149c6b66a0467c2a..cdc58e61d921737e339ad0f13701e336f29c76c4 100644 (file)
--- a/net/mac80211/ht.c
+++ b/net/mac80211/ht.c
@@ -141,7 +141,6 @@ void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
                             struct sta_info *sta,
                             struct ieee80211_mgmt *mgmt, size_t len)
 {
-       struct ieee80211_local *local = sdata->local;
        u16 tid, params;
        u16 initiator;
 
@@ -161,10 +160,9 @@ void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
                                                 WLAN_BACK_INITIATOR, 0);
        else { /* WLAN_BACK_RECIPIENT */
                spin_lock_bh(&sta->lock);
-               sta->ampdu_mlme.tid_state_tx[tid] =
-                               HT_AGG_STATE_OPERATIONAL;
+               if (sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK)
+                       ___ieee80211_stop_tx_ba_session(sta, tid,
+                                                       WLAN_BACK_RECIPIENT);
                spin_unlock_bh(&sta->lock);
-               ieee80211_stop_tx_ba_session(&local->hw, sta->sta.addr, tid,
-                                            WLAN_BACK_RECIPIENT);
        }
 }

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index a910bf1f092f301e973f9b9e8be6899f93f6655f..10d316e455de26424110df78364beb3cd12732b3 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1091,6 +1091,8 @@ void ieee80211_process_addba_request(struct ieee80211_local *local,
 
 int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
                                   enum ieee80211_back_parties initiator);
+int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
+                                   enum ieee80211_back_parties initiator);
 
 /* Spectrum management */
 void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,