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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: Scott Mayhew <smayhew@redhat.com>
Cc: stable@vger.kernel.org
Fixes: 0751ddf77b "lockd: Register callbacks on the inetaddr_chain..."
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
hifive-unleashed-5.1
Scott Mayhew 2016-06-30 10:39:32 -04:00 committed by J. Bruce Fields
parent 4c2e07c6a2
commit cb7d224f82
1 changed files with 10 additions and 3 deletions
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13
fs/lockd/svc.c
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@ -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 @@ err_create:
err_start:
lockd_down_net(serv, net);
goto err_net;
err_net:
lockd_unregister_notifiers();
goto err_put;
}
EXPORT_SYMBOL_GPL(lockd_up);