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| author | Marek Lindner <lindner_marek@yahoo.de> | 2011-04-20 15:40:58 +0200 |
|---|---|---|
| committer | Sven Eckelmann <sven@narfation.org> | 2011-05-01 22:49:03 +0200 |
| commit | 32ae9b221e788413ce68feaae2ca39e406211a0a (patch) | |
| tree | d827f989976a28fea5cdcb349c308baa98182c35 /net/batman-adv/send.c | |
| parent | 71e4aa9c465fd66c110667ab5d620fb6a4ef2157 (diff) | |
| download | lwn-32ae9b221e788413ce68feaae2ca39e406211a0a.tar.gz lwn-32ae9b221e788413ce68feaae2ca39e406211a0a.zip | |
batman-adv: Make bat_priv->primary_if an rcu protected pointer
The rcu protected macros rcu_dereference() and rcu_assign_pointer()
for the bat_priv->primary_if need to be used, as well as spin/rcu locking.
Otherwise we might end up using a primary_if pointer pointing to already
freed memory.
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Diffstat (limited to 'net/batman-adv/send.c')
| -rw-r--r-- | net/batman-adv/send.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c index 7650e2bf187d..02b541a6dfef 100644 --- a/net/batman-adv/send.c +++ b/net/batman-adv/send.c @@ -244,6 +244,7 @@ static void rebuild_batman_packet(struct bat_priv *bat_priv, void schedule_own_packet(struct hard_iface *hard_iface) { struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); + struct hard_iface *primary_if; unsigned long send_time; struct batman_packet *batman_packet; int vis_server; @@ -253,6 +254,7 @@ void schedule_own_packet(struct hard_iface *hard_iface) return; vis_server = atomic_read(&bat_priv->vis_mode); + primary_if = primary_if_get_selected(bat_priv); /** * the interface gets activated here to avoid race conditions between @@ -266,7 +268,7 @@ void schedule_own_packet(struct hard_iface *hard_iface) /* if local hna has changed and interface is a primary interface */ if ((atomic_read(&bat_priv->hna_local_changed)) && - (hard_iface == bat_priv->primary_if)) + (hard_iface == primary_if)) rebuild_batman_packet(bat_priv, hard_iface); /** @@ -284,7 +286,7 @@ void schedule_own_packet(struct hard_iface *hard_iface) else batman_packet->flags &= ~VIS_SERVER; - if ((hard_iface == bat_priv->primary_if) && + if ((hard_iface == primary_if) && (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER)) batman_packet->gw_flags = (uint8_t)atomic_read(&bat_priv->gw_bandwidth); @@ -299,6 +301,9 @@ void schedule_own_packet(struct hard_iface *hard_iface) hard_iface->packet_buff, hard_iface->packet_len, hard_iface, 1, send_time); + + if (primary_if) + hardif_free_ref(primary_if); } void schedule_forward_packet(struct orig_node *orig_node, @@ -403,6 +408,7 @@ static void _add_bcast_packet_to_list(struct bat_priv *bat_priv, * skb is freed. */ int add_bcast_packet_to_list(struct bat_priv *bat_priv, struct sk_buff *skb) { + struct hard_iface *primary_if = NULL; struct forw_packet *forw_packet; struct bcast_packet *bcast_packet; @@ -411,7 +417,8 @@ int add_bcast_packet_to_list(struct bat_priv *bat_priv, struct sk_buff *skb) goto out; } - if (!bat_priv->primary_if) + primary_if = primary_if_get_selected(bat_priv); + if (!primary_if) goto out; forw_packet = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC); @@ -430,7 +437,7 @@ int add_bcast_packet_to_list(struct bat_priv *bat_priv, struct sk_buff *skb) skb_reset_mac_header(skb); forw_packet->skb = skb; - forw_packet->if_incoming = bat_priv->primary_if; + forw_packet->if_incoming = primary_if; /* how often did we send the bcast packet ? */ forw_packet->num_packets = 0; @@ -443,6 +450,8 @@ packet_free: out_and_inc: atomic_inc(&bat_priv->bcast_queue_left); out: + if (primary_if) + hardif_free_ref(primary_if); return NETDEV_TX_BUSY; } |