lockd: lost rollback of set_grace_period() in lockd_down_net()

Commit efda760fe95ea ("lockd: fix lockd shutdown race") is incorrect,
it removes lockd_manager and disarm grace_period_end for init_net only.

If nfsd was started from another net namespace lockd_up_net() calls
set_grace_period() that adds lockd_manager into per-netns list
and queues grace_period_end delayed work.

These action should be reverted in lockd_down_net().
Otherwise it can lead to double list_add on after restart nfsd in netns,
and to use-after-free if non-disarmed delayed work will be executed after netns destroy.

Fixes: efda760fe95e ("lockd: fix lockd shutdown race")
Cc: stable@vger.kernel.org
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index cb659ef789c086d8067c3edd1036ce6f7c2470c9..4acf0ebd9802a759042a76c8c5779e1ca58b6468 100644 (file)
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -274,6 +274,8 @@ static void lockd_down_net(struct svc_serv *serv, struct net *net)
        if (ln->nlmsvc_users) {
                if (--ln->nlmsvc_users == 0) {
                        nlm_shutdown_hosts_net(net);
+                       cancel_delayed_work_sync(&ln->grace_period_end);
+                       locks_end_grace(&ln->lockd_manager);
                        svc_shutdown_net(serv, net);
                        dprintk("%s: per-net data destroyed; net=%x\n",
                                __func__, net->ns.inum);