linux-kernel - [PATCH 3.16 036/346] batman-adv: Fix orig_node_vlan leak on orig_node

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Message-ID: <lsq.1479082460.407290673@decadent.org.uk>
Date:   Mon, 14 Nov 2016 00:14:20 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Sven Eckelmann" <sven@...fation.org>,
        "Simon Wunderlich" <sw@...onwunderlich.de>,
        "Marek Lindner" <mareklindner@...mailbox.ch>
Subject: [PATCH 3.16 036/346] batman-adv: Fix orig_node_vlan leak on
 orig_node_release

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

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

From: Sven Eckelmann <sven@...fation.org>

commit 33fbb1f3db87ce53da925b3e034b4dd446d483f8 upstream.

batadv_orig_node_new uses batadv_orig_node_vlan_new to allocate a new
batadv_orig_node_vlan and add it to batadv_orig_node::vlan_list. References
to this list have also to be cleaned when the batadv_orig_node is removed.

Fixes: 7ea7b4a14275 ("batman-adv: make the TT CRC logic VLAN specific")
Signed-off-by: Sven Eckelmann <sven@...fation.org>
Signed-off-by: Marek Lindner <mareklindner@...mailbox.ch>
Signed-off-by: Simon Wunderlich <sw@...onwunderlich.de>
[bwh: Backported to 3.16:
 - vlan_list is a list not an hlist
 - s/_put/_free_ref/]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/batman-adv/originator.c | 8 ++++++++
 1 file changed, 8 insertions(+)

--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -529,6 +529,7 @@ static void batadv_orig_node_release(str
 	struct hlist_node *node_tmp;
 	struct batadv_neigh_node *neigh_node;
 	struct batadv_orig_ifinfo *orig_ifinfo;
+	struct batadv_orig_node_vlan *vlan, *vlan_tmp;
 
 	spin_lock_bh(&orig_node->neigh_list_lock);
 
@@ -546,6 +547,13 @@ static void batadv_orig_node_release(str
 	}
 	spin_unlock_bh(&orig_node->neigh_list_lock);
 
+	spin_lock_bh(&orig_node->vlan_list_lock);
+	list_for_each_entry_safe(vlan, vlan_tmp, &orig_node->vlan_list, list) {
+		list_del_rcu(&vlan->list);
+		batadv_orig_node_vlan_free_ref(vlan);
+	}
+	spin_unlock_bh(&orig_node->vlan_list_lock);
+
 	/* Free nc_nodes */
 	batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);