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batman-adv: Use kref_get for batadv_gw_select

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batadv_gw_select requires that the caller already has a valid reference for
new_gw_node. It is therefore not possible that it has an reference counter
of 0 and was still given to this function

The kref_get function instead WARNs (with debug information) when the
reference counter would still be 0. This makes a bug in batman-adv better
visible because kref_get_unless_zero would have ignored this problem.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <a@unstable.cc>
This commit is contained in:
Sven Eckelmann 2016-03-05 16:09:22 +01:00 committed by Antonio Quartulli
parent 0de32ceee1
commit a08d497d67
1 changed files with 2 additions and 2 deletions
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4
net/batman-adv/gateway_client.c
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@ -135,8 +135,8 @@ static void batadv_gw_select(struct batadv_priv *bat_priv,
spin_lock_bh(&bat_priv->gw.list_lock);
if (new_gw_node && !kref_get_unless_zero(&new_gw_node->refcount))
new_gw_node = NULL;
if (new_gw_node)
kref_get(&new_gw_node->refcount);
curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1);
rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node);