fanotify: do not send events for irregular files

fanotify_should_send_event has a test to see if an object is a file or
directory and does not send an event otherwise.  The problem is that the
test is actually checking if the object with a mark is a file or directory,
not if the object the event happened on is a file or directory.  We should
check the latter.

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

1 files changed, 6 insertions, 5 deletions

diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index 60c11c306fd9..8d98e1f5817b 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -160,20 +160,21 @@ static bool fanotify_should_send_event(struct fsnotify_group *group,
                                        __u32 event_mask, void *data, int data_type)
 {
         __u32 marks_mask, marks_ignored_mask;
+        struct path *path = data;
 
         pr_debug("%s: group=%p to_tell=%p inode_mark=%p vfsmnt_mark=%p "
                  "mask=%x data=%p data_type=%d\n", __func__, group, to_tell,
                  inode_mark, vfsmnt_mark, event_mask, data, data_type);
 
-        /* sorry, fanotify only gives a damn about files and dirs */
-        if (!S_ISREG(to_tell->i_mode) &&
-            !S_ISDIR(to_tell->i_mode))
-                return false;
-
         /* if we don't have enough info to send an event to userspace say no */
         if (data_type != FSNOTIFY_EVENT_PATH)
                 return false;
 
+        /* sorry, fanotify only gives a damn about files and dirs */
+        if (!S_ISREG(path->dentry->d_inode->i_mode) &&
+            !S_ISDIR(path->dentry->d_inode->i_mode))
+                return false;
+
         if (inode_mark && vfsmnt_mark) {
                 marks_mask = (vfsmnt_mark->mask | inode_mark->mask);
                 marks_ignored_mask = (vfsmnt_mark->ignored_mask | inode_mark->ignored_mask);