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lockd: double unregister of inetaddr notifiers

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lockd_up() can call lockd_unregister_notifiers twice:
inside lockd_start_svc() when it calls lockd_svc_exit_thread()
and then in error path of lockd_up()

Patch forces lockd_start_svc() to unregister notifiers in all error cases
and removes extra unregister in error path of lockd_up().

Fixes: cb7d224f82e4 "lockd: unregister notifier blocks if the service ..."
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Cc: stable@vger.kernel.org
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Vasily Averin 2017-10-20 17:33:18 +03:00 committed by J. Bruce Fields
parent 53da6a53e1
commit dc3033e16c
1 changed files with 9 additions and 11 deletions
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20
fs/lockd/svc.c
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@ -369,6 +369,7 @@ static int lockd_start_svc(struct svc_serv *serv)
printk(KERN_WARNING
"lockd_up: svc_rqst allocation failed, error=%d\n",
error);
lockd_unregister_notifiers();
goto out_rqst;
}
@ -459,13 +460,16 @@ int lockd_up(struct net *net)
}
error = lockd_up_net(serv, net);
if (error < 0)
goto err_net;
if (error < 0) {
lockd_unregister_notifiers();
goto err_put;
}
error = lockd_start_svc(serv);
if (error < 0)
goto err_start;
if (error < 0) {
lockd_down_net(serv, net);
goto err_put;
}
nlmsvc_users++;
/*
* Note: svc_serv structures have an initial use count of 1,
@ -476,12 +480,6 @@ err_put:
err_create:
mutex_unlock(&nlmsvc_mutex);
return error;
err_start:
lockd_down_net(serv, net);
err_net:
lockd_unregister_notifiers();
goto err_put;
}
EXPORT_SYMBOL_GPL(lockd_up);