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authorVasily Averin <vvs@virtuozzo.com>2017-11-02 13:03:42 +0300
committerJ. Bruce Fields <bfields@redhat.com>2017-11-27 16:45:11 -0500
commit3a2b19d1ee5633f76ae8a88da7bc039a5d1732aa (patch)
tree80d14fdd5067ee6d26a13765daa50a50abf18ebf /fs/lockd
parentlockd: added cleanup checks in exit_net hook (diff)
downloadlinux-dev-3a2b19d1ee5633f76ae8a88da7bc039a5d1732aa.tar.xz
linux-dev-3a2b19d1ee5633f76ae8a88da7bc039a5d1732aa.zip
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>
Diffstat (limited to 'fs/lockd')
-rw-r--r--fs/lockd/svc.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index cb659ef789c0..4acf0ebd9802 100644
--- 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);