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| author | Sven Eckelmann <sven@narfation.org> | 2016-03-05 16:09:22 +0100 |
|---|---|---|
| committer | Antonio Quartulli <a@unstable.cc> | 2016-05-10 18:28:29 +0800 |
| commit | a08d497d6718d579e496a801115aecc1c4fbb770 (patch) | |
| tree | 072f27ad47d2579fa3079dab370e1fd98b47f525 /net/batman-adv/gateway_client.c | |
| parent | 0de32ceee156787429035c974316f4e5098cf722 (diff) | |
| download | linux-0-day-a08d497d6718d579e496a801115aecc1c4fbb770.tar.gz linux-0-day-a08d497d6718d579e496a801115aecc1c4fbb770.tar.xz | |
batman-adv: Use kref_get for batadv_gw_select
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>
Diffstat (limited to 'net/batman-adv/gateway_client.c')
| -rw-r--r-- | net/batman-adv/gateway_client.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c index c59aff5ccac8a..bb1c4f37716ee 100644 --- a/net/batman-adv/gateway_client.c +++ b/net/batman-adv/gateway_client.c @@ -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); |