linux-kernel - [ 16/66] mac80211: Only process mesh config header on frames that RA

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Date:	Wed, 14 Nov 2012 20:10:21 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Chaoxing Lin <Chaoxing.Lin@...ra-3eti.com>,
	Javier Cardona <javier@...ybit.com>,
	Johannes Berg <johannes.berg@...el.com>
Subject: [ 16/66] mac80211: Only process mesh config header on frames that RA_MATCH

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

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

From: Javier Cardona <javier@...ybit.com>

commit 555cb715be8ef98b8ec362b23dfc254d432a35b1 upstream.

Doing otherwise is wrong, and may wreak havoc on the mpp tables,
specially if the frame is encrypted.

Reported-by: Chaoxing Lin <Chaoxing.Lin@...ra-3eti.com>
Signed-off-by: Javier Cardona <javier@...ybit.com>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/mac80211/rx.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1857,7 +1857,8 @@ ieee80211_rx_h_mesh_fwding(struct ieee80
 	    mesh_rmc_check(hdr->addr3, mesh_hdr, rx->sdata))
 		return RX_DROP_MONITOR;
 
-	if (!ieee80211_is_data(hdr->frame_control))
+	if (!ieee80211_is_data(hdr->frame_control) ||
+	    !(status->rx_flags & IEEE80211_RX_RA_MATCH))
 		return RX_CONTINUE;
 
 	if (!mesh_hdr->ttl)
@@ -1901,9 +1902,6 @@ ieee80211_rx_h_mesh_fwding(struct ieee80
 	}
 	skb_set_queue_mapping(skb, q);
 
-	if (!(status->rx_flags & IEEE80211_RX_RA_MATCH))
-		goto out;
-
 	if (!--mesh_hdr->ttl) {
 		IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl);
 		return RX_DROP_MONITOR;


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