linux-kernel - [48/53] batman-adv: fix tt_local_reset

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Date:	Tue, 22 Nov 2011 16:25:48 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Antonio Quartulli <ordex@...istici.org>,
	Junkeun Song <jun361@...il.com>,
	Marek Lindner <lindner_marek@...oo.de>
Subject: [48/53] batman-adv: fix tt_local_reset_flags() function

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

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

From: Antonio Quartulli <ordex@...istici.org>

commit 31901264511cf20c5ed33b8649a3ca9ce28df60b upstream.

Currently the counter of tt_local_entry structures (tt_local_num) is incremented
each time the tt_local_reset_flags() is invoked causing the node to send wrong
TT_REPONSE packets containing a copy of non-initialised memory thus corrupting
other nodes global translation table and making higher level communication
impossible.

Reported-by: Junkeun Song <jun361@...il.com>
Signed-off-by: Antonio Quartulli <ordex@...istici.org>
Acked-by: Junkeun Song <jun361@...il.com>
Signed-off-by: Marek Lindner <lindner_marek@...oo.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/batman-adv/translation-table.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -1668,6 +1668,8 @@ static void tt_local_reset_flags(struct
 		rcu_read_lock();
 		hlist_for_each_entry_rcu(tt_local_entry, node,
 					 head, hash_entry) {
+			if (!(tt_local_entry->flags & flags))
+				continue;
 			tt_local_entry->flags &= ~flags;
 			atomic_inc(&bat_priv->num_local_tt);
 		}


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