inotify: fix length reporting and size checking

0db501bd0610ee0c0 introduced a regresion in that it now sends a nul
terminator but the length accounting when checking for space or
reporting to userspace did not take this into account.  This corrects
all of the rounding logic.

Signed-off-by: Eric Paris <eparis@redhat.com>

diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index b547ae17b46124db884913bf94bb534d1048f18c..6111670b25736a9a91e38e2fe76f14ecd1f16fb0 100644 (file)
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -154,7 +154,8 @@ static struct fsnotify_event *get_one_event(struct fsnotify_group *group,
 
        event = fsnotify_peek_notify_event(group);
 
-       event_size += roundup(event->name_len, event_size);
+       if (event->name_len)
+               event_size += roundup(event->name_len + 1, event_size);
 
        if (event_size > count)
                return ERR_PTR(-EINVAL);
@@ -327,8 +328,9 @@ static long inotify_ioctl(struct file *file, unsigned int cmd,
                list_for_each_entry(holder, &group->notification_list, event_list) {
                        event = holder->event;
                        send_len += sizeof(struct inotify_event);
-                       send_len += roundup(event->name_len,
-                                            sizeof(struct inotify_event));
+                       if (event->name_len)
+                               send_len += roundup(event->name_len + 1,
+                                               sizeof(struct inotify_event));
                }
                mutex_unlock(&group->notification_mutex);
                ret = put_user(send_len, (int __user *) p);