netdev - [PATCH 3/3] batman-adv: avoid NULL dereferences and fix if check

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Message-Id: <1419079737-31107-4-git-send-email-sven@narfation.org>
Date:	Sat, 20 Dec 2014 13:48:57 +0100
From:	Sven Eckelmann <sven@...fation.org>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, Antonio Quartulli <antonio@...hcoding.com>,
	Marek Lindner <mareklindner@...mailbox.ch>
Subject: [PATCH 3/3] batman-adv: avoid NULL dereferences and fix if check

From: Antonio Quartulli <antonio@...hcoding.com>

Gateway having bandwidth_down equal to zero are not accepted
at all and so never added to the Gateway list.
For this reason checking the bandwidth_down member in
batadv_gw_out_of_range() is useless.

This is probably a copy/paste error and this check was supposed
to be "!gw_node" only. Moreover, the way the check is written
now may also lead to a NULL dereference.

Fix this by rewriting the if-condition properly.

Introduced by 414254e342a0d58144de40c3da777521ebaeeb07
("batman-adv: tvlv - gateway download/upload bandwidth container")

Signed-off-by: Antonio Quartulli <antonio@...hcoding.com>
Reported-by: David Binderman <dcb314@...mail.com>
Signed-off-by: Marek Lindner <mareklindner@...mailbox.ch>
---
Problem is in the kernel since v3.13 and may be important for the stable tree.

 net/batman-adv/gateway_client.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c
index 90cff58..e0bcf9e 100644
--- a/net/batman-adv/gateway_client.c
+++ b/net/batman-adv/gateway_client.c
@@ -810,7 +810,7 @@ bool batadv_gw_out_of_range(struct batadv_priv *bat_priv,
 		goto out;
 
 	gw_node = batadv_gw_node_get(bat_priv, orig_dst_node);
-	if (!gw_node->bandwidth_down == 0)
+	if (!gw_node)
 		goto out;
 
 	switch (atomic_read(&bat_priv->gw_mode)) {
-- 
2.1.4

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