diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index edc339d649c4..49f86fa56bff 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -690,9 +690,11 @@ static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
 		}
 	}
 
-	memset(&wrqu, 0, sizeof(wrqu));
-	wrqu.data.length = len;
-	wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
+	if (len <= IW_CUSTOM_MAX) {
+		memset(&wrqu, 0, sizeof(wrqu));
+		wrqu.data.length = len;
+		wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
+	}
 
 	kfree(buf);
 }