linux-kernel - [PATCH AUTOSEL 5.2 018/249] batman-adv: fix for leaked TVLV handler.

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Message-Id: <20190715134655.4076-18-sashal@kernel.org>
Date:   Mon, 15 Jul 2019 09:43:03 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jeremy Sowden <jeremy@...zel.net>,
        syzbot+d454a826e670502484b8@...kaller.appspotmail.com,
        Simon Wunderlich <sw@...onwunderlich.de>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.2 018/249] batman-adv: fix for leaked TVLV handler.

From: Jeremy Sowden <jeremy@...zel.net>

[ Upstream commit 17f78dd1bd624a4dd78ed5db3284a63ee807fcc3 ]

A handler for BATADV_TVLV_ROAM was being registered when the
translation-table was initialized, but not unregistered when the
translation-table was freed.  Unregister it.

Fixes: 122edaa05940 ("batman-adv: tvlv - convert roaming adv packet to use tvlv unicast packets")
Reported-by: syzbot+d454a826e670502484b8@...kaller.appspotmail.com
Signed-off-by: Jeremy Sowden <jeremy@...zel.net>
Signed-off-by: Sven Eckelmann <sven@...fation.org
Signed-off-by: Simon Wunderlich <sw@...onwunderlich.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/batman-adv/translation-table.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 1ddfd5e011ee..8a482c5ec67b 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -3813,6 +3813,8 @@ static void batadv_tt_purge(struct work_struct *work)
  */
 void batadv_tt_free(struct batadv_priv *bat_priv)
 {
+	batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_ROAM, 1);
+
 	batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
 	batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
 
-- 
2.20.1