| From | Ben Hutchings <> | Date | Sun, 09 Dec 2018 21:50:33 +0000 | Subject | [PATCH 3.16 217/328] batman-adv: Place kref_get for softif_vlan near use |
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3.16.62-rc1 review patch. If anyone has any objections, please let me know.
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From: Sven Eckelmann <sven@narfation.org>
commit df28ca6bb3282a4c8dc5b65f60b0136fc190ee52 upstream.
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> [bwh: Backported to 3.16: - s/kref_get/atomic_inc/ - s/_put/_free_ref/] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- net/batman-adv/soft-interface.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/net/batman-adv/soft-interface.c +++ b/net/batman-adv/soft-interface.c @@ -529,6 +529,7 @@ int batadv_softif_create_vlan(struct bat } spin_lock_bh(&bat_priv->softif_vlan_list_lock); + atomic_inc(&vlan->refcount); hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list); spin_unlock_bh(&bat_priv->softif_vlan_list_lock); @@ -539,6 +540,9 @@ int batadv_softif_create_vlan(struct bat bat_priv->soft_iface->dev_addr, vid, BATADV_NULL_IFINDEX, BATADV_NO_MARK); + /* don't return reference to new softif_vlan */ + batadv_softif_vlan_free_ref(vlan); + return 0; }
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