[ 15/57] mac80211: dont inspect Sequence Control field on control frames

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Javier Cardona <redacted>

commit f7fbf70ee9db6da6033ae50d100e017ac1f26555 upstream.

Per IEEE Std. 802.11-2012, Sec 8.2.4.4.1, the sequence Control field is
not present in control frames.  We noticed this problem when processing
Block Ack Requests.

Signed-off-by: Javier Cardona <redacted>
Signed-off-by: Javier Lopez <redacted>
Signed-off-by: Johannes Berg <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/mac80211/rx.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c

@@ -1465,6 +1465,10 @@ ieee80211_rx_h_defragment(struct ieee802
 
 	hdr = (struct ieee80211_hdr *)rx->skb->data;
 	fc = hdr->frame_control;
+
+	if (ieee80211_is_ctl(fc))
+		return RX_CONTINUE;
+
 	sc = le16_to_cpu(hdr->seq_ctrl);
 	frag = sc & IEEE80211_SCTL_FRAG;