batman-adv: Fix list removal of batadv_hardif_neigh_node
authorSven Eckelmann <sven@narfation.org>
Tue, 5 Jan 2016 11:06:17 +0000 (12:06 +0100)
committerAntonio Quartulli <a@unstable.cc>
Wed, 13 Jan 2016 11:28:27 +0000 (19:28 +0800)
commitbab7c6c3deac70966a3000402c0ea6d0c20edd15
treed6d644c3db05abb5451cd6811f53acd594e9c6be
parentaf63cf51b7f960aa73b32bac683cd4078f08fa0e
batman-adv: Fix list removal of batadv_hardif_neigh_node

The neigh_list with batadv_hardif_neigh_node objects is accessed with only
rcu_read_lock in batadv_hardif_neigh_get and batadv_iv_neigh_print. Thus it
is not allowed to kfree the object before the rcu grace period ends (which
may still protects context accessing this object). Therefore the object has
first to be removed from the neigh_list and then it has either wait with
synchronize_rcu or call_rcu till the grace period ends before it can be
freed.

Fixes: cef63419f7db ("batman-adv: add list of unique single hop neighbors per hard-interface")
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/originator.c