Created attachment 160001 [details] patch "mac80211: fix use-after-free in defragmentation" (b8fff407a180286aa683d543d878d98d9fc57b13) introduced two little bugs. As multicast-frames are never fragmented, "dot11MulticastReceivedFrameCount" would never be incremented. Furthermore, the RX-LED will be triggered by every multicast frame (which wouldn't happen before) which wouldn't allow my LED to rest at all. I hope the appended patch and original commit message allows to clarify that.
Patch looks fine, I'll apply it. In the future, please submit wireless patches to the mailing list (linux-wireless@vger.kernel.org) instead of here.