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| author | Linus Lüssing <linus.luessing@ascom.ch> | 2011-02-13 21:13:04 +0000 |
|---|---|---|
| committer | Marek Lindner <lindner_marek@yahoo.de> | 2011-03-05 12:50:12 +0100 |
| commit | 43c70ad5ce5691cce24dae6610731694c0f3fcc8 (patch) | |
| tree | 7dc7a769a166f846aebac8e37b3dfcdad9b6dc86 /net/batman-adv | |
| parent | 5d02b3cdfafeb23ab7cf43ef1d2118007370e8d0 (diff) | |
| download | kernel_samsung_smdk4412-43c70ad5ce5691cce24dae6610731694c0f3fcc8.zip kernel_samsung_smdk4412-43c70ad5ce5691cce24dae6610731694c0f3fcc8.tar.gz kernel_samsung_smdk4412-43c70ad5ce5691cce24dae6610731694c0f3fcc8.tar.bz2 | |
batman-adv: Increase orig_node refcount before releasing rcu read lock
When unicast_send_skb() is increasing the orig_node's refcount another
thread might have been freeing this orig_node already. We need to
increase the refcount in the rcu read lock protected area to avoid that.
Signed-off-by: Linus Lüssing <linus.luessing@ascom.ch>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Diffstat (limited to 'net/batman-adv')
| -rw-r--r-- | net/batman-adv/gateway_client.c | 3 | ||||
| -rw-r--r-- | net/batman-adv/unicast.c | 5 |
2 files changed, 5 insertions, 3 deletions
diff --git a/net/batman-adv/gateway_client.c b/net/batman-adv/gateway_client.c index a3e842f..41eba8a 100644 --- a/net/batman-adv/gateway_client.c +++ b/net/batman-adv/gateway_client.c @@ -54,6 +54,9 @@ void *gw_get_selected(struct bat_priv *bat_priv) orig_node = curr_gateway_tmp->orig_node; + if (orig_node) + kref_get(&orig_node->refcount); + out: rcu_read_unlock(); return orig_node; diff --git a/net/batman-adv/unicast.c b/net/batman-adv/unicast.c index 7ca994c..0603cea 100644 --- a/net/batman-adv/unicast.c +++ b/net/batman-adv/unicast.c @@ -293,10 +293,9 @@ int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv) spin_lock_bh(&bat_priv->orig_hash_lock); /* get routing information */ - if (is_multicast_ether_addr(ethhdr->h_dest)) + if (is_multicast_ether_addr(ethhdr->h_dest)) { orig_node = (struct orig_node *)gw_get_selected(bat_priv); - if (orig_node) { - kref_get(&orig_node->refcount); + if (orig_node) goto find_router; } |