From: Sven Eckelmann <[email protected]> When an interface gets disabled, the worker is correctly disabled by batadv_hardif_disable_interface() -> ... -> batadv_v_ogm_iface_disable(). In this process, the skb aggr_list is also freed.
But batadv_v_ogm_send_meshif() can still queue new skbs (via batadv_v_ogm_queue_on_if()) to the aggr_list. This will only stop after all cores can no longer find the RCU protected list of hard interfaces. These queued skbs will never be freed or consumed by batadv_v_ogm_aggr_work. The batadv_v_ogm_iface_disable() function must block batadv_v_ogm_queue_on_if() to avoid leak of skbs. Cc: [email protected] Fixes: f89255a02f1d ("batman-adv: BATMAN_V: introduce per hard-iface OGMv2 queues") Signed-off-by: Sven Eckelmann <[email protected]> Signed-off-by: Simon Wunderlich <[email protected]> --- net/batman-adv/bat_v.c | 1 + net/batman-adv/bat_v_ogm.c | 12 ++++++++++++ net/batman-adv/types.h | 6 ++++++ 3 files changed, 19 insertions(+) diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c index fe7c0113d0df3..db6f5bdcaa985 100644 --- a/net/batman-adv/bat_v.c +++ b/net/batman-adv/bat_v.c @@ -817,6 +817,7 @@ void batadv_v_hardif_init(struct batadv_hard_iface *hard_iface) hard_iface->bat_v.aggr_len = 0; skb_queue_head_init(&hard_iface->bat_v.aggr_list); + hard_iface->bat_v.aggr_list_enabled = false; INIT_DELAYED_WORK(&hard_iface->bat_v.aggr_wq, batadv_v_ogm_aggr_work); /* make sure it doesn't run until interface gets enabled */ diff --git a/net/batman-adv/bat_v_ogm.c b/net/batman-adv/bat_v_ogm.c index 81926ef9c02c9..95efd8a43c79d 100644 --- a/net/batman-adv/bat_v_ogm.c +++ b/net/batman-adv/bat_v_ogm.c @@ -254,11 +254,18 @@ static void batadv_v_ogm_queue_on_if(struct batadv_priv *bat_priv, } spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); + if (!hard_iface->bat_v.aggr_list_enabled) { + kfree_skb(skb); + goto unlock; + } + if (!batadv_v_ogm_queue_left(skb, hard_iface)) batadv_v_ogm_aggr_send(bat_priv, hard_iface); hard_iface->bat_v.aggr_len += batadv_v_ogm_len(skb); __skb_queue_tail(&hard_iface->bat_v.aggr_list, skb); + +unlock: spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); } @@ -415,6 +422,10 @@ int batadv_v_ogm_iface_enable(struct batadv_hard_iface *hard_iface) { struct batadv_priv *bat_priv = netdev_priv(hard_iface->mesh_iface); + spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); + hard_iface->bat_v.aggr_list_enabled = true; + spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); + enable_delayed_work(&hard_iface->bat_v.aggr_wq); batadv_v_ogm_start_queue_timer(hard_iface); @@ -432,6 +443,7 @@ void batadv_v_ogm_iface_disable(struct batadv_hard_iface *hard_iface) disable_delayed_work_sync(&hard_iface->bat_v.aggr_wq); spin_lock_bh(&hard_iface->bat_v.aggr_list.lock); + hard_iface->bat_v.aggr_list_enabled = false; batadv_v_ogm_aggr_list_free(hard_iface); spin_unlock_bh(&hard_iface->bat_v.aggr_list.lock); } diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h index 5fd5bd358a249..5e81c93b8217d 100644 --- a/net/batman-adv/types.h +++ b/net/batman-adv/types.h @@ -145,6 +145,12 @@ struct batadv_hard_iface_bat_v { /** @aggr_list: queue for to be aggregated OGM packets */ struct sk_buff_head aggr_list; + /** + * @aggr_list_enabled: aggr_list is active and new skbs can be + * enqueued. Protected by aggr_list.lock after initialization + */ + bool aggr_list_enabled:1; + /** @aggr_len: size of the OGM aggregate (excluding ethernet header) */ unsigned int aggr_len; -- 2.47.3
