From: Sven Eckelmann sven@narfation.org
batadv_nc_get_nc_node requires that the caller already has a valid reference for orig_neigh_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 --- net/batman-adv/network-coding.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c index 1da8e0e1b18f..953dff1ad43b 100644 --- a/net/batman-adv/network-coding.c +++ b/net/batman-adv/network-coding.c @@ -856,8 +856,7 @@ batadv_nc_get_nc_node(struct batadv_priv *bat_priv, if (!nc_node) return NULL;
- if (!kref_get_unless_zero(&orig_neigh_node->refcount)) - goto free; + kref_get(&orig_neigh_node->refcount);
/* Initialize nc_node */ INIT_LIST_HEAD(&nc_node->list); @@ -884,10 +883,6 @@ batadv_nc_get_nc_node(struct batadv_priv *bat_priv, spin_unlock_bh(lock);
return nc_node; - -free: - kfree(nc_node); - return NULL; }
/**