netdev - [PATCH] batman-adv: fix NULL pointer dereferences

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Message-Id: <1401157547-25199-2-git-send-email-antonio@meshcoding.com>
Date:	Tue, 27 May 2014 04:25:47 +0200
From:	Antonio Quartulli <antonio@...hcoding.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, b.a.t.m.a.n@...ts.open-mesh.org,
	Marek Lindner <mareklindner@...mailbox.ch>,
	Linus Lüssing <linus.luessing@....de>,
	Antonio Quartulli <antonio@...hcoding.com>
Subject: [PATCH] batman-adv: fix NULL pointer dereferences

From: Marek Lindner <mareklindner@...mailbox.ch>

Was introduced with 4c8755d69cbde2ec464a39c932aed0a83f9ff89f
("batman-adv: Send multicast packets to nodes with a WANT_ALL flag")

Reported-by: Sven Eckelmann <sven@...fation.org>
Signed-off-by: Marek Lindner <mareklindner@...mailbox.ch>
Acked-by: Antonio Quartulli <antonio@...hcoding.com>
Signed-off-by: Linus Lüssing <linus.luessing@....de>
Signed-off-by: Antonio Quartulli <antonio@...hcoding.com>
---
 net/batman-adv/multicast.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
index 8c7ca81..96b66fd 100644
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -415,7 +415,7 @@ batadv_mcast_forw_ipv4_node_get(struct batadv_priv *bat_priv)
 	hlist_for_each_entry_rcu(tmp_orig_node,
 				 &bat_priv->mcast.want_all_ipv4_list,
 				 mcast_want_all_ipv4_node) {
-		if (!atomic_inc_not_zero(&orig_node->refcount))
+		if (!atomic_inc_not_zero(&tmp_orig_node->refcount))
 			continue;
 
 		orig_node = tmp_orig_node;
@@ -442,7 +442,7 @@ batadv_mcast_forw_ipv6_node_get(struct batadv_priv *bat_priv)
 	hlist_for_each_entry_rcu(tmp_orig_node,
 				 &bat_priv->mcast.want_all_ipv6_list,
 				 mcast_want_all_ipv6_node) {
-		if (!atomic_inc_not_zero(&orig_node->refcount))
+		if (!atomic_inc_not_zero(&tmp_orig_node->refcount))
 			continue;
 
 		orig_node = tmp_orig_node;
@@ -493,7 +493,7 @@ batadv_mcast_forw_unsnoop_node_get(struct batadv_priv *bat_priv)
 	hlist_for_each_entry_rcu(tmp_orig_node,
 				 &bat_priv->mcast.want_all_unsnoopables_list,
 				 mcast_want_all_unsnoopables_node) {
-		if (!atomic_inc_not_zero(&orig_node->refcount))
+		if (!atomic_inc_not_zero(&tmp_orig_node->refcount))
 			continue;
 
 		orig_node = tmp_orig_node;
-- 
1.8.5.5

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