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authorMarek Lindner <lindner_marek@yahoo.de>2011-02-10 14:33:51 +0000
committerMarek Lindner <lindner_marek@yahoo.de>2011-03-05 12:50:07 +0100
commited75ccbe26f4a672a41556120390e67c80a2c441 (patch)
tree3f4f844d2311e662b4c42e7a275188d1346ac77d /net/batman-adv/hard-interface.c
parent7d2b554826195372764910da2f0dcb0d9b869108 (diff)
batman-adv: Correct rcu refcounting for batman_if
It might be possible that 2 threads access the same data in the same rcu grace period. The first thread calls call_rcu() to decrement the refcount and free the data while the second thread increases the refcount to use the data. To avoid this race condition all refcount operations have to be atomic. Reported-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Diffstat (limited to 'net/batman-adv/hard-interface.c')
-rw-r--r--net/batman-adv/hard-interface.c40
1 files changed, 19 insertions, 21 deletions
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
index e2b001ad45c..89824853d6e 100644
--- a/net/batman-adv/hard-interface.c
+++ b/net/batman-adv/hard-interface.c
@@ -40,13 +40,13 @@ static int batman_skb_recv(struct sk_buff *skb,
struct packet_type *ptype,
struct net_device *orig_dev);
-static void hardif_free_rcu(struct rcu_head *rcu)
+void hardif_free_rcu(struct rcu_head *rcu)
{
struct batman_if *batman_if;
batman_if = container_of(rcu, struct batman_if, rcu);
dev_put(batman_if->net_dev);
- kref_put(&batman_if->refcount, hardif_free_ref);
+ kfree(batman_if);
}
struct batman_if *get_batman_if_by_netdev(struct net_device *net_dev)
@@ -55,16 +55,14 @@ struct batman_if *get_batman_if_by_netdev(struct net_device *net_dev)
rcu_read_lock();
list_for_each_entry_rcu(batman_if, &if_list, list) {
- if (batman_if->net_dev == net_dev)
+ if (batman_if->net_dev == net_dev &&
+ atomic_inc_not_zero(&batman_if->refcount))
goto out;
}
batman_if = NULL;
out:
- if (batman_if)
- kref_get(&batman_if->refcount);
-
rcu_read_unlock();
return batman_if;
}
@@ -105,16 +103,14 @@ static struct batman_if *get_active_batman_if(struct net_device *soft_iface)
if (batman_if->soft_iface != soft_iface)
continue;
- if (batman_if->if_status == IF_ACTIVE)
+ if (batman_if->if_status == IF_ACTIVE &&
+ atomic_inc_not_zero(&batman_if->refcount))
goto out;
}
batman_if = NULL;
out:
- if (batman_if)
- kref_get(&batman_if->refcount);
-
rcu_read_unlock();
return batman_if;
}
@@ -137,14 +133,14 @@ static void set_primary_if(struct bat_priv *bat_priv,
struct batman_packet *batman_packet;
struct batman_if *old_if;
- if (batman_if)
- kref_get(&batman_if->refcount);
+ if (batman_if && !atomic_inc_not_zero(&batman_if->refcount))
+ batman_if = NULL;
old_if = bat_priv->primary_if;
bat_priv->primary_if = batman_if;
if (old_if)
- kref_put(&old_if->refcount, hardif_free_ref);
+ hardif_free_ref(old_if);
if (!bat_priv->primary_if)
return;
@@ -290,6 +286,9 @@ int hardif_enable_interface(struct batman_if *batman_if, char *iface_name)
if (batman_if->if_status != IF_NOT_IN_USE)
goto out;
+ if (!atomic_inc_not_zero(&batman_if->refcount))
+ goto out;
+
batman_if->soft_iface = dev_get_by_name(&init_net, iface_name);
if (!batman_if->soft_iface) {
@@ -328,7 +327,6 @@ int hardif_enable_interface(struct batman_if *batman_if, char *iface_name)
batman_if->batman_adv_ptype.type = __constant_htons(ETH_P_BATMAN);
batman_if->batman_adv_ptype.func = batman_skb_recv;
batman_if->batman_adv_ptype.dev = batman_if->net_dev;
- kref_get(&batman_if->refcount);
dev_add_pack(&batman_if->batman_adv_ptype);
atomic_set(&batman_if->seqno, 1);
@@ -371,6 +369,7 @@ out:
return 0;
err:
+ hardif_free_ref(batman_if);
return -ENOMEM;
}
@@ -387,7 +386,6 @@ void hardif_disable_interface(struct batman_if *batman_if)
bat_info(batman_if->soft_iface, "Removing interface: %s\n",
batman_if->net_dev->name);
dev_remove_pack(&batman_if->batman_adv_ptype);
- kref_put(&batman_if->refcount, hardif_free_ref);
bat_priv->num_ifaces--;
orig_hash_del_if(batman_if, bat_priv->num_ifaces);
@@ -399,7 +397,7 @@ void hardif_disable_interface(struct batman_if *batman_if)
set_primary_if(bat_priv, new_if);
if (new_if)
- kref_put(&new_if->refcount, hardif_free_ref);
+ hardif_free_ref(new_if);
}
kfree(batman_if->packet_buff);
@@ -416,6 +414,7 @@ void hardif_disable_interface(struct batman_if *batman_if)
softif_destroy(batman_if->soft_iface);
batman_if->soft_iface = NULL;
+ hardif_free_ref(batman_if);
}
static struct batman_if *hardif_add_interface(struct net_device *net_dev)
@@ -445,7 +444,8 @@ static struct batman_if *hardif_add_interface(struct net_device *net_dev)
batman_if->soft_iface = NULL;
batman_if->if_status = IF_NOT_IN_USE;
INIT_LIST_HEAD(&batman_if->list);
- kref_init(&batman_if->refcount);
+ /* extra reference for return */
+ atomic_set(&batman_if->refcount, 2);
check_known_mac_addr(batman_if->net_dev);
@@ -453,8 +453,6 @@ static struct batman_if *hardif_add_interface(struct net_device *net_dev)
list_add_tail_rcu(&batman_if->list, &if_list);
spin_unlock(&if_list_lock);
- /* extra reference for return */
- kref_get(&batman_if->refcount);
return batman_if;
free_if:
@@ -476,7 +474,7 @@ static void hardif_remove_interface(struct batman_if *batman_if)
batman_if->if_status = IF_TO_BE_REMOVED;
sysfs_del_hardif(&batman_if->hardif_obj);
- call_rcu(&batman_if->rcu, hardif_free_rcu);
+ hardif_free_ref(batman_if);
}
void hardif_remove_interfaces(void)
@@ -548,7 +546,7 @@ static int hard_if_event(struct notifier_block *this,
};
hardif_put:
- kref_put(&batman_if->refcount, hardif_free_ref);
+ hardif_free_ref(batman_if);
out:
return NOTIFY_DONE;
}