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-rw-r--r--net/ipv4/ip_sockglue.c19
1 files changed, 15 insertions, 4 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 08b9519a24f4..47fff528ff39 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -241,9 +241,13 @@ int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
struct ip_ra_chain *ip_ra_chain;
static DEFINE_SPINLOCK(ip_ra_lock);
-static void ip_ra_free_rcu(struct rcu_head *head)
+
+static void ip_ra_destroy_rcu(struct rcu_head *head)
{
- kfree(container_of(head, struct ip_ra_chain, rcu));
+ struct ip_ra_chain *ra = container_of(head, struct ip_ra_chain, rcu);
+
+ sock_put(ra->saved_sk);
+ kfree(ra);
}
int ip_ra_control(struct sock *sk, unsigned char on,
@@ -264,13 +268,20 @@ int ip_ra_control(struct sock *sk, unsigned char on,
kfree(new_ra);
return -EADDRINUSE;
}
+ /* dont let ip_call_ra_chain() use sk again */
+ ra->sk = NULL;
rcu_assign_pointer(*rap, ra->next);
spin_unlock_bh(&ip_ra_lock);
if (ra->destructor)
ra->destructor(sk);
- sock_put(sk);
- call_rcu(&ra->rcu, ip_ra_free_rcu);
+ /*
+ * Delay sock_put(sk) and kfree(ra) after one rcu grace
+ * period. This guarantee ip_call_ra_chain() dont need
+ * to mess with socket refcounts.
+ */
+ ra->saved_sk = sk;
+ call_rcu(&ra->rcu, ip_ra_destroy_rcu);
return 0;
}
}