[3.13.y-ckt stable] Patch "mac80211: fix multicast LED blinking and counter" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    mac80211: fix multicast LED blinking and counter

to the linux-3.13.y-queue branch of the 3.13.y-ckt extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.13.y-queue

This patch is scheduled to be released in version 3.13.11-ckt15.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 129aa59666fbd724ef669755003405c19fe192cc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andreas=20M=C3=BCller?= <goo at stapelspeicher.org>
Date: Fri, 12 Dec 2014 12:11:11 +0100
Subject: mac80211: fix multicast LED blinking and counter
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

commit d025933e29872cb1fe19fc54d80e4dfa4ee5779c upstream.

As multicast-frames can't be fragmented, "dot11MulticastReceivedFrameCount"
stopped being incremented after the use-after-free fix. Furthermore, the
RX-LED will be triggered by every multicast frame (which wouldn't happen
before) which wouldn't allow the LED to rest at all.

Fixes https://bugzilla.kernel.org/show_bug.cgi?id=89431 which also had the
patch.

Fixes: b8fff407a180 ("mac80211: fix use-after-free in defragmentation")
Signed-off-by: Andreas Müller <goo at stapelspeicher.org>
[rewrite commit message]
Signed-off-by: Johannes Berg <johannes.berg at intel.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 net/mac80211/rx.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 7b9e78a..10109f4 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1647,14 +1647,14 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
 	sc = le16_to_cpu(hdr->seq_ctrl);
 	frag = sc & IEEE80211_SCTL_FRAG;

-	if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
-		goto out;
-
 	if (is_multicast_ether_addr(hdr->addr1)) {
 		rx->local->dot11MulticastReceivedFrameCount++;
-		goto out;
+		goto out_no_led;
 	}

+	if (likely(!ieee80211_has_morefrags(fc) && frag == 0))
+		goto out;
+
 	I802_DEBUG_INC(rx->local->rx_handlers_fragments);

 	if (skb_linearize(rx->skb))
@@ -1745,9 +1745,10 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
 	status->rx_flags |= IEEE80211_RX_FRAGMENTED;

  out:
+	ieee80211_led_rx(rx->local);
+ out_no_led:
 	if (rx->sta)
 		rx->sta->rx_packets++;
-	ieee80211_led_rx(rx->local);
 	return RX_CONTINUE;
 }

--
1.9.1