Repository : ssh://git@open-mesh.org/batman-adv

On branch : maint

commit fc3e79d9ef2a1006f94e441d9613749cbbe7176a Author: Sven Eckelmann sven@narfation.org Date: Fri May 6 22:27:09 2016 +0200

batman-adv: Fix double neigh_node_put in batadv_v_ogm_route_update

The router is put down twice when it was non-NULL and either orig_ifinfo is NULL afterwards or batman-adv receives a packet with the same sequence number. This will end up in a use-after-free when the batadv_neigh_node is removed because the reference counter ended up too early at 0.

Fixes: 667996ebeab4 ("batman-adv: OGMv2 - implement originators logic") Reported-by: Gui Iribarren gui@altermundi.net Tested-by: Antonio Quartulli a@unstable.cc Tested-by: Marek Lindner mareklindner@neomailbox.ch Signed-off-by: Sven Eckelmann sven@narfation.org Signed-off-by: Marek Lindner mareklindner@neomailbox.ch

fc3e79d9ef2a1006f94e441d9613749cbbe7176a net/batman-adv/bat_v_ogm.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/batman-adv/bat_v_ogm.c b/net/batman-adv/bat_v_ogm.c index d9bcbe6..91df28a 100644 --- a/net/batman-adv/bat_v_ogm.c +++ b/net/batman-adv/bat_v_ogm.c @@ -529,8 +529,10 @@ static void batadv_v_ogm_route_update(struct batadv_priv *bat_priv, goto out; }

- if (router) + if (router) { batadv_neigh_node_put(router); + router = NULL; + }

/* Update routes, and check if the OGM is from the best next hop */ batadv_v_ogm_orig_update(bat_priv, orig_node, neigh_node, ogm2,