From: Sven Eckelmann sven@narfation.org
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: 9323158ef9f4 ("batman-adv: OGMv2 - implement originators logic") Signed-off-by: Sven Eckelmann sven@narfation.org Signed-off-by: Antonio Quartulli a@unstable.cc --- 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 d9bcbe6e7d65..91df28a100f9 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,