sysfs: fix parent refcounting during rename and move

Parent reference wasn't properly transferred during rename and move.
Fix it.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index a63d12e4be56..a26e3db89432 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -497,6 +497,9 @@ int sysfs_rename_dir(struct kobject * kobj, struct dentry *new_parent,
         d_move(kobj->dentry, new_dentry);
 
         list_del_init(&sd->s_sibling);
+        sysfs_get(parent_sd);
+        sysfs_put(sd->s_parent);
+        sd->s_parent = parent_sd;
         list_add(&sd->s_sibling, &parent_sd->s_children);
 
         error = 0;
@@ -550,6 +553,9 @@ again:
 
         /* Remove from old parent's list and insert into new parent's list. */
         list_del_init(&sd->s_sibling);
+        sysfs_get(new_parent_sd);
+        sysfs_put(sd->s_parent);
+        sd->s_parent = new_parent_sd;
         list_add(&sd->s_sibling, &new_parent_sd->s_children);
 
 out: