提交 cb7d224f 编写于 作者: S Scott Mayhew 提交者: J. Bruce Fields

lockd: unregister notifier blocks if the service fails to come up completely

If the lockd service fails to start up then we need to be sure that the
notifier blocks are not registered, otherwise a subsequent start of the
service could cause the same notifier to be registered twice, leading to
soft lockups.
Signed-off-by: NScott Mayhew <smayhew@redhat.com>
Cc: stable@vger.kernel.org
Fixes: 0751ddf7 "lockd: Register callbacks on the inetaddr_chain..."
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>
上级 4c2e07c6
......@@ -335,12 +335,17 @@ static struct notifier_block lockd_inet6addr_notifier = {
};
#endif
static void lockd_svc_exit_thread(void)
static void lockd_unregister_notifiers(void)
{
unregister_inetaddr_notifier(&lockd_inetaddr_notifier);
#if IS_ENABLED(CONFIG_IPV6)
unregister_inet6addr_notifier(&lockd_inet6addr_notifier);
#endif
}
static void lockd_svc_exit_thread(void)
{
lockd_unregister_notifiers();
svc_exit_thread(nlmsvc_rqst);
}
......@@ -462,7 +467,7 @@ int lockd_up(struct net *net)
* Note: svc_serv structures have an initial use count of 1,
* so we exit through here on both success and failure.
*/
err_net:
err_put:
svc_destroy(serv);
err_create:
mutex_unlock(&nlmsvc_mutex);
......@@ -470,7 +475,9 @@ int lockd_up(struct net *net)
err_start:
lockd_down_net(serv, net);
goto err_net;
err_net:
lockd_unregister_notifiers();
goto err_put;
}
EXPORT_SYMBOL_GPL(lockd_up);
......
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