fsnotify: Fix detection whether overflow event is queued

Currently we didn't initialize event's list head when we removed it from
the event list. Thus a detection whether overflow event is already
queued wasn't working. Fix it by always initializing the list head when
deleting event from a list.

Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/notify/notification.c b/fs/notify/notification.c
index 18b3c4427dca..6bec2f4918f9 100644
--- a/fs/notify/notification.c
+++ b/fs/notify/notification.c
@@ -132,7 +132,11 @@ struct fsnotify_event *fsnotify_remove_notify_event(struct fsnotify_group *group
 
         event = list_first_entry(&group->notification_list,
                                  struct fsnotify_event, list);
-        list_del(&event->list);
+        /*
+         * We need to init list head for the case of overflow event so that
+         * check in fsnotify_add_notify_events() works
+         */
+        list_del_init(&event->list);
         group->q_len--;
 
         return event;