This is a note to let you know that I've just added the patch titled
lockd: double unregister of inetaddr notifiers
to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: lockd-double-unregister-of-inetaddr-notifiers.patch and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From dc3033e16c59a2c4e62b31341258a5786cbcee56 Mon Sep 17 00:00:00 2001
From: Vasily Averin vvs@virtuozzo.com Date: Fri, 20 Oct 2017 17:33:18 +0300 Subject: lockd: double unregister of inetaddr notifiers
From: Vasily Averin vvs@virtuozzo.com
commit dc3033e16c59a2c4e62b31341258a5786cbcee56 upstream.
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 Reviewed-by: Jeff Layton jlayton@kernel.org Signed-off-by: J. Bruce Fields bfields@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/lockd/svc.c | 20 +++++++++----------- 1 file changed, 9 insertions(+), 11 deletions(-)
--- a/fs/lockd/svc.c +++ b/fs/lockd/svc.c @@ -365,6 +365,7 @@ static int lockd_start_svc(struct svc_se printk(KERN_WARNING "lockd_up: svc_rqst allocation failed, error=%d\n", error); + lockd_unregister_notifiers(); goto out_rqst; }
@@ -455,13 +456,16 @@ 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, @@ -472,12 +476,6 @@ 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);
Patches currently in stable-queue which might be from vvs@virtuozzo.com are
queue-4.9/lockd-double-unregister-of-inetaddr-notifiers.patch