batman-adv: Correct rcu refcounting for softif_neigh

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>

diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 7e37077ed81667c061d52df9dbdf7a07ce919e11..152beaafae1d1ff3092374e8de17775c9b0736b8 100644 (file)
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -76,20 +76,18 @@ int my_skb_head_push(struct sk_buff *skb, unsigned int len)
        return 0;
 }
 
-static void softif_neigh_free_ref(struct kref *refcount)
+static void softif_neigh_free_rcu(struct rcu_head *rcu)
 {
        struct softif_neigh *softif_neigh;
 
-       softif_neigh = container_of(refcount, struct softif_neigh, refcount);
+       softif_neigh = container_of(rcu, struct softif_neigh, rcu);
        kfree(softif_neigh);
 }
 
-static void softif_neigh_free_rcu(struct rcu_head *rcu)
+static void softif_neigh_free_ref(struct softif_neigh *softif_neigh)
 {
-       struct softif_neigh *softif_neigh;
-
-       softif_neigh = container_of(rcu, struct softif_neigh, rcu);
-       kref_put(&softif_neigh->refcount, softif_neigh_free_ref);
+       if (atomic_dec_and_test(&softif_neigh->refcount))
+               call_rcu(&softif_neigh->rcu, softif_neigh_free_rcu);
 }
 
 void softif_neigh_purge(struct bat_priv *bat_priv)
@@ -116,11 +114,10 @@ void softif_neigh_purge(struct bat_priv *bat_priv)
                                 softif_neigh->addr, softif_neigh->vid);
                        softif_neigh_tmp = bat_priv->softif_neigh;
                        bat_priv->softif_neigh = NULL;
-                       kref_put(&softif_neigh_tmp->refcount,
-                                softif_neigh_free_ref);
+                       softif_neigh_free_ref(softif_neigh_tmp);
                }
 
-               call_rcu(&softif_neigh->rcu, softif_neigh_free_rcu);
+               softif_neigh_free_ref(softif_neigh);
        }
 
        spin_unlock_bh(&bat_priv->softif_neigh_lock);
@@ -141,8 +138,11 @@ static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
                if (softif_neigh->vid != vid)
                        continue;
 
+               if (!atomic_inc_not_zero(&softif_neigh->refcount))
+                       continue;
+
                softif_neigh->last_seen = jiffies;
-               goto found;
+               goto out;
        }
 
        softif_neigh = kzalloc(sizeof(struct softif_neigh), GFP_ATOMIC);
@@ -152,15 +152,14 @@ static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
        memcpy(softif_neigh->addr, addr, ETH_ALEN);
        softif_neigh->vid = vid;
        softif_neigh->last_seen = jiffies;
-       kref_init(&softif_neigh->refcount);
+       /* initialize with 2 - caller decrements counter by one */
+       atomic_set(&softif_neigh->refcount, 2);
 
        INIT_HLIST_NODE(&softif_neigh->list);
        spin_lock_bh(&bat_priv->softif_neigh_lock);
        hlist_add_head_rcu(&softif_neigh->list, &bat_priv->softif_neigh_list);
        spin_unlock_bh(&bat_priv->softif_neigh_lock);
 
-found:
-       kref_get(&softif_neigh->refcount);
 out:
        rcu_read_unlock();
        return softif_neigh;
@@ -264,7 +263,7 @@ static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
                         softif_neigh->addr, softif_neigh->vid);
                softif_neigh_tmp = bat_priv->softif_neigh;
                bat_priv->softif_neigh = softif_neigh;
-               kref_put(&softif_neigh_tmp->refcount, softif_neigh_free_ref);
+               softif_neigh_free_ref(softif_neigh_tmp);
                /* we need to hold the additional reference */
                goto err;
        }
@@ -282,7 +281,7 @@ static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
        }
 
 out:
-       kref_put(&softif_neigh->refcount, softif_neigh_free_ref);
+       softif_neigh_free_ref(softif_neigh);
 err:
        kfree_skb(skb);
        return;

diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index cfbeb45cd9b349ffd31d34fb85c93cc81aac69e5..96f7c224975b427f160befb2072c958b8ae47dab 100644 (file)
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -268,7 +268,7 @@ struct softif_neigh {
        uint8_t addr[ETH_ALEN];
        unsigned long last_seen;
        short vid;
-       struct kref refcount;
+       atomic_t refcount;
        struct rcu_head rcu;
 };