inotify: Fix fsnotify_mark refcount leak in inotify_update_existing_watch()

Commit 4d97f7d53da7dc83 ("inotify: Add flag IN_MASK_CREATE for
inotify_add_watch()") forgot to call fsnotify_put_mark() with
IN_MASK_CREATE after fsnotify_find_mark()

Fixes: 4d97f7d53da7dc83 ("inotify: Add flag IN_MASK_CREATE for inotify_add_watch()")
Signed-off-by: ZhangXiaoxu <zhangxiaoxu5@huawei.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 5 insertions, 2 deletions

diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index e2901fbb9f76..7b53598c8804 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -519,8 +519,10 @@ static int inotify_update_existing_watch(struct fsnotify_group *group,
         fsn_mark = fsnotify_find_mark(&inode->i_fsnotify_marks, group);
         if (!fsn_mark)
                 return -ENOENT;
-        else if (create)
-                return -EEXIST;
+        else if (create) {
+                ret = -EEXIST;
+                goto out;
+        }
 
         i_mark = container_of(fsn_mark, struct inotify_inode_mark, fsn_mark);
 
@@ -548,6 +550,7 @@ static int inotify_update_existing_watch(struct fsnotify_group *group,
         /* return the wd */
         ret = i_mark->wd;
 
+out:
         /* match the get from fsnotify_find_mark() */
         fsnotify_put_mark(fsn_mark);