diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index f34cc66..1327d42 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1768,6 +1768,17 @@
 
 	switch (mgmt->u.action.category) {
 	case WLAN_CATEGORY_BACK:
+		/*
+		 * The aggregation code is not prepared to handle
+		 * anything but STA/AP due to the BSSID handling;
+		 * IBSS could work in the code but isn't supported
+		 * by drivers or the standard.
+		 */
+		if (sdata->vif.type != NL80211_IFTYPE_STATION &&
+		    sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
+		    sdata->vif.type != NL80211_IFTYPE_AP)
+			return RX_DROP_MONITOR;
+
 		switch (mgmt->u.action.u.addba_req.action_code) {
 		case WLAN_ACTION_ADDBA_REQ:
 			if (len < (IEEE80211_MIN_ACTION_SIZE +