[IPV6]: Fix again the fl6_sock_lookup() fixed locking

YOSHIFUJI fairly pointed out, that the users increment should
be done under the ip6_sk_fl_lock not to give IPV6_FL_A_PUT a
chance to put this count to zero and release the flowlabel.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index e55ae1a..b12cc22 100644 (file)
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -210,9 +210,9 @@ struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label)
        for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) {
                struct ip6_flowlabel *fl = sfl->fl;
                if (fl->label == label) {
-                       read_unlock_bh(&ip6_sk_fl_lock);
                        fl->lastuse = jiffies;
                        atomic_inc(&fl->users);
+                       read_unlock_bh(&ip6_sk_fl_lock);
                        return fl;
                }
        }