linux-kernel - [PATCH 3.2 090/185] mac80211: don't attempt to reorder multicast frames

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Message-ID: <lsq.1388282923.377669219@decadent.org.uk>
Date:	Sun, 29 Dec 2013 03:08:43 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Blaise Gassend" <blaise@...tabletech.com>,
	"Johannes Berg" <johannes.berg@...el.com>
Subject: [PATCH 3.2 090/185] mac80211: don't attempt to reorder multicast
 frames

3.2.54-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Johannes Berg <johannes.berg@...el.com>

commit 051a41fa4ee14f5c39668f0980973b9a195de560 upstream.

Multicast frames can't be transmitted as part of an aggregation
session (such a session couldn't even be set up) so don't try to
reorder them. Trying to do so would cause the reorder to stop
working correctly since multicast QoS frames (as transmitted by
the Aruba APs this was found with) would cause sequence number
confusion in the buffer.

Reported-by: Blaise Gassend <blaise@...tabletech.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/mac80211/rx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -764,7 +764,8 @@ static void ieee80211_rx_reorder_ampdu(s
 	u16 sc;
 	int tid;
 
-	if (!ieee80211_is_data_qos(hdr->frame_control))
+	if (!ieee80211_is_data_qos(hdr->frame_control) ||
+	    is_multicast_ether_addr(hdr->addr1))
 		goto dont_reorder;
 
 	/*

--
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