[3.19.y-ckt stable] Patch "mac80211: enable assoc check for mesh interfaces" 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: enable assoc check for mesh interfaces

to the linux-3.19.y-queue branch of the 3.19.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.19.y-queue

This patch is scheduled to be released in version 3.19.8-ckt8.

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

For more information about the 3.19.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 8e4a090dd345225ee208552a98265164ce6af566 Mon Sep 17 00:00:00 2001
From: Bob Copeland <me at bobcopeland.com>
Date: Sat, 13 Jun 2015 10:16:31 -0400
Subject: mac80211: enable assoc check for mesh interfaces

commit 3633ebebab2bbe88124388b7620442315c968e8f upstream.

We already set a station to be associated when peering completes, both
in user space and in the kernel.  Thus we should always have an
associated sta before sending data frames to that station.

Failure to check assoc state can cause crashes in the lower-level driver
due to transmitting unicast data frames before driver sta structures
(e.g. ampdu state in ath9k) are initialized.  This occurred when
forwarding in the presence of fixed mesh paths: frames were transmitted
to stations with whom we hadn't yet completed peering.

Reported-by: Alexis Green <agreen at cococorp.com>
Tested-by: Jesse Jones <jjones at cococorp.com>
Signed-off-by: Bob Copeland <me at bobcopeland.com>
Signed-off-by: Johannes Berg <johannes.berg at intel.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 net/mac80211/tx.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 097821b..2fcaafa 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -302,9 +302,6 @@ ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
 	if (tx->sdata->vif.type == NL80211_IFTYPE_WDS)
 		return TX_CONTINUE;

-	if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
-		return TX_CONTINUE;
-
 	if (tx->flags & IEEE80211_TX_PS_BUFFERED)
 		return TX_CONTINUE;

--
1.9.1