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batman-adv: Place kref_get for gw_node near use

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It is hard to understand why the refcnt is increased when it isn't done
near the actual place the new reference is used. So using kref_get right
before the place which requires the reference and in the same function
helps to avoid accidental problems caused by incorrect reference counting.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Sven Eckelmann 2016-07-15 17:39:27 +02:00 • committed by Simon Wunderlich
parent 6a51e09d8b
commit f665fa7e85
1 changed files with 5 additions and 1 deletions
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6
net/batman-adv/gateway_client.c
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@ -339,14 +339,15 @@ static void batadv_gw_node_add(struct batadv_priv *bat_priv,
if (!gw_node) if (!gw_node)
return; return;
kref_init(&gw_node->refcount);
INIT_HLIST_NODE(&gw_node->list); INIT_HLIST_NODE(&gw_node->list);
kref_get(&orig_node->refcount); kref_get(&orig_node->refcount);
gw_node->orig_node = orig_node; gw_node->orig_node = orig_node;
gw_node->bandwidth_down = ntohl(gateway->bandwidth_down); gw_node->bandwidth_down = ntohl(gateway->bandwidth_down);
gw_node->bandwidth_up = ntohl(gateway->bandwidth_up); gw_node->bandwidth_up = ntohl(gateway->bandwidth_up);
kref_init(&gw_node->refcount);
spin_lock_bh(&bat_priv->gw.list_lock); spin_lock_bh(&bat_priv->gw.list_lock);
kref_get(&gw_node->refcount);
hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list); hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.list);
spin_unlock_bh(&bat_priv->gw.list_lock); spin_unlock_bh(&bat_priv->gw.list_lock);
@ -357,6 +358,9 @@ static void batadv_gw_node_add(struct batadv_priv *bat_priv,
ntohl(gateway->bandwidth_down) % 10, ntohl(gateway->bandwidth_down) % 10,
ntohl(gateway->bandwidth_up) / 10, ntohl(gateway->bandwidth_up) / 10,
ntohl(gateway->bandwidth_up) % 10); ntohl(gateway->bandwidth_up) % 10);
/* don't return reference to new gw_node */
batadv_gw_node_put(gw_node);
} }
/** /**