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Date:   Fri, 18 Sep 2020 11:03:19 +0800
From:   Xiyu Yang <>
To:     Marek Lindner <>,
        Simon Wunderlich <>,
        Antonio Quartulli <>,
        Sven Eckelmann <>,
        "David S. Miller" <>,
        Jakub Kicinski <>,,,
        Xiyu Yang <>,
        Xin Tan <>
Subject: [PATCH] batman-adv: Fix orig node refcnt leak when creating neigh node

batadv_neigh_node_create() is used to create a neigh node object, whose
fields will be initialized with the specific object. When a new
reference of the specific object is created during the initialization,
its refcount should be increased.

However, when "neigh_node" object initializes its orig_node field with
the "orig_node" object, the function forgets to hold the refcount of the
"orig_node", causing a potential refcount leak and use-after-free issue
for the reason that the object can be freed in other places.

Fix this issue by increasing the refcount of orig_node object during the
initialization and adding corresponding batadv_orig_node_put() in

Signed-off-by: Xiyu Yang <>
Signed-off-by: Xin Tan <>
 net/batman-adv/originator.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index 805d8969bdfb..d6c2296f8e35 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -306,6 +306,8 @@ static void batadv_neigh_node_release(struct kref *ref)
+	batadv_orig_node_put(neigh_node->orig_node);
 	kfree_rcu(neigh_node, rcu);
@@ -685,6 +687,7 @@ batadv_neigh_node_create(struct batadv_orig_node *orig_node,
 	ether_addr_copy(neigh_node->addr, neigh_addr);
 	neigh_node->if_incoming = hard_iface;
+	kref_get(&orig_node->refcount);
 	neigh_node->orig_node = orig_node;
 	neigh_node->last_seen = jiffies;

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