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Date:   Mon, 27 Apr 2020 17:00:39 +0200
From:   Simon Wunderlich <>
        Xiyu Yang <>,
        Xin Tan <>,
        Sven Eckelmann <>,
        Simon Wunderlich <>
Subject: [PATCH 4/4] batman-adv: Fix refcnt leak in batadv_v_ogm_process

From: Xiyu Yang <>

batadv_v_ogm_process() invokes batadv_hardif_neigh_get(), which returns
a reference of the neighbor object to "hardif_neigh" with increased

When batadv_v_ogm_process() returns, "hardif_neigh" becomes invalid, so
the refcount should be decreased to keep refcount balanced.

The reference counting issue happens in one exception handling paths of
batadv_v_ogm_process(). When batadv_v_ogm_orig_get() fails to get the
orig node and returns NULL, the refcnt increased by
batadv_hardif_neigh_get() is not decreased, causing a refcnt leak.

Fix this issue by jumping to "out" label when batadv_v_ogm_orig_get()
fails to get the orig node.

Fixes: 9323158ef9f4 ("batman-adv: OGMv2 - implement originators logic")
Signed-off-by: Xiyu Yang <>
Signed-off-by: Xin Tan <>
Signed-off-by: Sven Eckelmann <>
Signed-off-by: Simon Wunderlich <>
 net/batman-adv/bat_v_ogm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/batman-adv/bat_v_ogm.c b/net/batman-adv/bat_v_ogm.c
index 969466218999..80b87b1f4e3a 100644
--- a/net/batman-adv/bat_v_ogm.c
+++ b/net/batman-adv/bat_v_ogm.c
@@ -893,7 +893,7 @@ static void batadv_v_ogm_process(const struct sk_buff *skb, int ogm_offset,
 	orig_node = batadv_v_ogm_orig_get(bat_priv, ogm_packet->orig);
 	if (!orig_node)
-		return;
+		goto out;
 	neigh_node = batadv_neigh_node_get_or_create(orig_node, if_incoming,

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