From fc3e79d9ef2a1006f94e441d9613749cbbe7176a Mon Sep 17 00:00:00 2001 From: Sven Eckelmann Date: Fri, 6 May 2016 22:27:09 +0200 Subject: [PATCH 5/6] 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 Tested-by: Antonio Quartulli Tested-by: Marek Lindner Signed-off-by: Sven Eckelmann Signed-off-by: Marek Lindner --- 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, -- 2.8.0.rc3