diff options
| author | Vasily Averin <vvs@virtuozzo.com> | 2017-11-02 11:03:42 +0100 |
|---|---|---|
| committer | J. Bruce Fields <bfields@redhat.com> | 2017-11-27 22:45:11 +0100 |
| commit | 3a2b19d1ee5633f76ae8a88da7bc039a5d1732aa (patch) | |
| tree | 80d14fdd5067ee6d26a13765daa50a50abf18ebf /fs/lockd | |
| parent | lockd: added cleanup checks in exit_net hook (diff) | |
| download | linux-3a2b19d1ee5633f76ae8a88da7bc039a5d1732aa.tar.xz linux-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.c | 2 |
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); |