mac80211: fix some RX aggregation locking

A few places in mac80211 do not currently acquire
the sta lock for RX aggregation, but they should.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 62053fa..f42d506 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -720,14 +720,16 @@ static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
 
        tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
 
+       spin_lock(&sta->lock);
+
        if (!sta->ampdu_mlme.tid_active_rx[tid])
-               goto dont_reorder;
+               goto dont_reorder_unlock;
 
        tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
 
        /* qos null data frames are excluded */
        if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC)))
-               goto dont_reorder;
+               goto dont_reorder_unlock;
 
        /* new, potentially un-ordered, ampdu frame - process it */
 
@@ -739,15 +741,20 @@ static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx,
        /* if this mpdu is fragmented - terminate rx aggregation session */
        sc = le16_to_cpu(hdr->seq_ctrl);
        if (sc & IEEE80211_SCTL_FRAG) {
+               spin_unlock(&sta->lock);
                __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
                                               WLAN_REASON_QSTA_REQUIRE_SETUP);
                dev_kfree_skb(skb);
                return;
        }
 
-       if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames))
+       if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames)) {
+               spin_unlock(&sta->lock);
                return;
+       }
 
+ dont_reorder_unlock:
+       spin_unlock(&sta->lock);
  dont_reorder:
        __skb_queue_tail(frames, skb);
 }
@@ -1804,9 +1811,12 @@ ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
        if (ieee80211_is_back_req(bar->frame_control)) {
                if (!rx->sta)
                        return RX_DROP_MONITOR;
+               spin_lock(&rx->sta->lock);
                tid = le16_to_cpu(bar->control) >> 12;
-               if (!rx->sta->ampdu_mlme.tid_active_rx[tid])
+               if (!rx->sta->ampdu_mlme.tid_active_rx[tid]) {
+                       spin_unlock(&rx->sta->lock);
                        return RX_DROP_MONITOR;
+               }
                tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid];
 
                start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
@@ -1820,6 +1830,7 @@ ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames)
                ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num,
                                                 frames);
                kfree_skb(skb);
+               spin_unlock(&rx->sta->lock);
                return RX_QUEUED;
        }