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authorAntonio Quartulli <ordex@autistici.org>2013-04-19 11:04:52 +0200
committerDavid S. Miller <davem@davemloft.net>2013-04-22 20:40:48 -0400
commit0c501345ce24983d234fc913e7e81b6abe59cb54 (patch)
treec08635c7a029036a7bf71f79a11c1a21e5b6204c /net/batman-adv/soft-interface.c
parent6e0895c2ea326cc4bb11e8fa2f654628d5754c31 (diff)
batman-adv: fix global protection fault during soft_iface destruction
batadv_mesh_free() schedules some RCU callbacks which need the bat_priv struct to do their jobs, while free_netdev(), which is called immediately after, is destroying the private data. Put an rcu_barrier() in the middle so that free_netdev() is invoked only after all the callbacks returned. This bug has been introduced by ab8f433dd39be94e8617cff2dfe9f7eca162eb15 ("batman-adv: Move deinitialization of soft-interface to destructor") Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/batman-adv/soft-interface.c')
-rw-r--r--net/batman-adv/soft-interface.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 403b8c46085..6f20d339e33 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -582,6 +582,13 @@ static void batadv_softif_free(struct net_device *dev)
{
batadv_debugfs_del_meshif(dev);
batadv_mesh_free(dev);
+
+ /* some scheduled RCU callbacks need the bat_priv struct to accomplish
+ * their tasks. Wait for them all to be finished before freeing the
+ * netdev and its private data (bat_priv)
+ */
+ rcu_barrier();
+
free_netdev(dev);
}