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authorLino Sanfilippo <LinoSanfilippo@gmx.de>2010-11-24 18:26:04 +0100
committerEric Paris <eparis@redhat.com>2010-12-07 16:14:24 -0500
commitfdbf3ceeb659f0b3c0e8dd79b331b7ac05910f1e (patch)
tree72ed0abad8e550cfa54d83c677d3a9baba28f110 /fs/notify/fanotify/fanotify_user.c
parente9a3854fd4ff3907e6c200a3980e19365ee695e9 (diff)
fanotify: Dont try to open a file descriptor for the overflow event
We should not try to open a file descriptor for the overflow event since this will always fail. Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de> Signed-off-by: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'fs/notify/fanotify/fanotify_user.c')
-rw-r--r--fs/notify/fanotify/fanotify_user.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index ca54957b1f6..dccd7985e65 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -110,6 +110,8 @@ static int fill_event_metadata(struct fsnotify_group *group,
struct fanotify_event_metadata *metadata,
struct fsnotify_event *event)
{
+ int ret = 0;
+
pr_debug("%s: group=%p metadata=%p event=%p\n", __func__,
group, metadata, event);
@@ -117,9 +119,15 @@ static int fill_event_metadata(struct fsnotify_group *group,
metadata->vers = FANOTIFY_METADATA_VERSION;
metadata->mask = event->mask & FAN_ALL_OUTGOING_EVENTS;
metadata->pid = pid_vnr(event->tgid);
- metadata->fd = create_fd(group, event);
+ if (unlikely(event->mask & FAN_Q_OVERFLOW))
+ metadata->fd = FAN_NOFD;
+ else {
+ metadata->fd = create_fd(group, event);
+ if (metadata->fd < 0)
+ ret = metadata->fd;
+ }
- return metadata->fd;
+ return ret;
}
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
@@ -261,7 +269,7 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
if (ret < 0)
goto out;
- fd = ret;
+ fd = fanotify_event_metadata.fd;
ret = prepare_for_access_response(group, event, fd);
if (ret)
goto out_close_fd;
@@ -275,7 +283,8 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
out_kill_access_response:
remove_access_response(group, event, fd);
out_close_fd:
- sys_close(fd);
+ if (fd != FAN_NOFD)
+ sys_close(fd);
out:
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
if (event->mask & FAN_ALL_PERM_EVENTS) {