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| author | Eric Paris <eparis@redhat.com> | 2009-08-16 21:51:44 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-08-17 13:37:37 -0700 |
| commit | eef3a116be11d35396efb2a8cc7345fd3221e294 (patch) | |
| tree | 2a5d0b36dd5985f29eac43f51b03e610e40b7c9b /fs/notify/notification.c | |
| parent | 0f66f96d21b4bbff49baaa337546e687d7c58e87 (diff) | |
| download | lwn-eef3a116be11d35396efb2a8cc7345fd3221e294.tar.gz lwn-eef3a116be11d35396efb2a8cc7345fd3221e294.zip | |
notify: unused event private race
inotify decides if private data it passed to get added to an event was
used by checking list_empty(). But it's possible that the event may
have been dequeued and the private event removed so it would look empty.
The fix is to use the return code from fsnotify_add_notify_event rather
than looking at the list.
Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/notify/notification.c')
| -rw-r--r-- | fs/notify/notification.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/fs/notify/notification.c b/fs/notify/notification.c index 521368574e97..74b3cf30bc6b 100644 --- a/fs/notify/notification.c +++ b/fs/notify/notification.c @@ -171,9 +171,7 @@ int fsnotify_add_notify_event(struct fsnotify_group *group, struct fsnotify_even struct list_head *list = &group->notification_list; struct fsnotify_event_holder *last_holder; struct fsnotify_event *last_event; - - /* easy to tell if priv was attached to the event */ - INIT_LIST_HEAD(&priv->event_list); + int ret = 0; /* * There is one fsnotify_event_holder embedded inside each fsnotify_event. @@ -194,6 +192,7 @@ alloc_holder: if (group->q_len >= group->max_events) { event = &q_overflow_event; + ret = -EOVERFLOW; /* sorry, no private data on the overflow event */ priv = NULL; } @@ -235,7 +234,7 @@ alloc_holder: mutex_unlock(&group->notification_mutex); wake_up(&group->notification_waitq); - return 0; + return ret; } /* |