linux-kernel - [PATCH 3.4 03/92] mac80211: enable assoc check for mesh interfaces

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Date:	Mon, 18 Apr 2016 18:45:08 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Bob Copeland <me@...copeland.com>,
	Johannes Berg <johannes.berg@...el.com>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 03/92] mac80211: enable assoc check for mesh interfaces

From: Bob Copeland <me@...copeland.com>

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

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

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@...ocorp.com>
Tested-by: Jesse Jones <jjones@...ocorp.com>
Signed-off-by: Bob Copeland <me@...copeland.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 net/mac80211/tx.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index f4f24be..67cd0f1 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -284,9 +284,6 @@ 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