static void
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
-@@ -2369,6 +2369,7 @@ ieee80211_rx_h_action(struct ieee80211_r
+@@ -936,8 +936,14 @@ ieee80211_rx_h_check(struct ieee80211_rx
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
+ struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
+
+- /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */
+- if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) {
++ /*
++ * Drop duplicate 802.11 retransmissions
++ * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery")
++ */
++ if (rx->skb->len >= 24 && rx->sta &&
++ !ieee80211_is_ctl(hdr->frame_control) &&
++ !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
++ !is_multicast_ether_addr(hdr->addr1)) {
+ if (unlikely(ieee80211_has_retry(hdr->frame_control) &&
+ rx->sta->last_seq_ctrl[rx->seqno_idx] ==
+ hdr->seq_ctrl)) {
+@@ -2369,6 +2375,7 @@ ieee80211_rx_h_action(struct ieee80211_r
sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
sdata->vif.type != NL80211_IFTYPE_AP &&
sdata->vif.type != NL80211_IFTYPE_ADHOC)
break;
-@@ -2720,14 +2721,15 @@ ieee80211_rx_h_mgmt(struct ieee80211_rx_
+@@ -2720,14 +2727,15 @@ ieee80211_rx_h_mgmt(struct ieee80211_rx_
if (!ieee80211_vif_is_mesh(&sdata->vif) &&
sdata->vif.type != NL80211_IFTYPE_ADHOC &&
break;
case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP):
case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP):
-@@ -3059,10 +3061,16 @@ static int prepare_for_handlers(struct i
+@@ -3059,10 +3067,16 @@ static int prepare_for_handlers(struct i
}
break;
case NL80211_IFTYPE_WDS: