ipv6: add complete rcu protection around np->opt

[pandora-kernel.git] / net / ipv6 / af_inet6.c

diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index d27c797..b161144 100644 (file)
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -430,8 +430,11 @@ void inet6_destroy_sock(struct sock *sk)
 
        /* Free tx options */
 
-       if ((opt = xchg(&np->opt, NULL)) != NULL)
-               sock_kfree_s(sk, opt, opt->tot_len);
+       opt = xchg((__force struct ipv6_txoptions **)&np->opt, NULL);
+       if (opt) {
+               atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
+               txopt_put(opt);
+       }
 }
 
 EXPORT_SYMBOL_GPL(inet6_destroy_sock);
@@ -669,7 +672,10 @@ int inet6_sk_rebuild_header(struct sock *sk)
                fl6.fl6_sport = inet->inet_sport;
                security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 
-               final_p = fl6_update_dst(&fl6, np->opt, &final);
+               rcu_read_lock();
+               final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
+                                        &final);
+               rcu_read_unlock();
 
                dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
                if (IS_ERR(dst)) {