1 files changed, 31 insertions, 1 deletions

diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 7a3dbde9979e..87fc012e4ab3 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -707,6 +707,7 @@ static void ieee80211_iface_work(struct work_struct *work)
                 container_of(work, struct ieee80211_sub_if_data, work);
         struct ieee80211_local *local = sdata->local;
         struct sk_buff *skb;
+        struct sta_info *sta;
 
         if (!ieee80211_sdata_running(sdata))
                 return;
@@ -729,7 +730,6 @@ static void ieee80211_iface_work(struct work_struct *work)
                 if (ieee80211_is_action(mgmt->frame_control) &&
                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
                         int len = skb->len;
-                        struct sta_info *sta;
 
                         rcu_read_lock();
                         sta = sta_info_get(sdata, mgmt->sa);
@@ -753,6 +753,36 @@ static void ieee80211_iface_work(struct work_struct *work)
                                 }
                         }
                         rcu_read_unlock();
+                } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
+                        struct ieee80211_hdr *hdr = (void *)mgmt;
+                        /*
+                         * So the frame isn't mgmt, but frame_control
+                         * is at the right place anyway, of course, so
+                         * the if statement is correct.
+                         *
+                         * Warn if we have other data frame types here,
+                         * they must not get here.
+                         */
+                        WARN_ON(hdr->frame_control &
+                                        cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
+                        WARN_ON(!(hdr->seq_ctrl &
+                                        cpu_to_le16(IEEE80211_SCTL_FRAG)));
+                        /*
+                         * This was a fragment of a frame, received while
+                         * a block-ack session was active. That cannot be
+                         * right, so terminate the session.
+                         */
+                        rcu_read_lock();
+                        sta = sta_info_get(sdata, mgmt->sa);
+                        if (sta) {
+                                u16 tid = *ieee80211_get_qos_ctl(hdr) &
+                                                IEEE80211_QOS_CTL_TID_MASK;
+
+                                __ieee80211_stop_rx_ba_session(
+                                        sta, tid, WLAN_BACK_RECIPIENT,
+                                        WLAN_REASON_QSTA_REQUIRE_SETUP);
+                        }
+                        rcu_read_unlock();
                 } else switch (sdata->vif.type) {
                 case NL80211_IFTYPE_STATION:
                         ieee80211_sta_rx_queued_mgmt(sdata, skb);