From: Miklos Szeredi <miklos@szeredi.hu>

This patch clears mnt_namespace in an expired mount. 

If mnt_namespace is not cleared, it's possible to attach a new mount to the
already detached mount, because check_mnt() can return true.

The effect is a resource leak, since the resulting tree will never be
freed.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 fs/namespace.c |    1 +
 1 files changed, 1 insertion(+)

diff -puN fs/namespace.c~namespacec-fix-mnt_namespace-zeroing-for-expired-mounts fs/namespace.c
--- 25/fs/namespace.c~namespacec-fix-mnt_namespace-zeroing-for-expired-mounts	Wed May 25 14:37:43 2005
+++ 25-akpm/fs/namespace.c	Wed May 25 14:37:43 2005
@@ -843,6 +843,7 @@ static void expire_mount(struct vfsmount
 
 		/* delete from the namespace */
 		list_del_init(&mnt->mnt_list);
+		mnt->mnt_namespace = NULL;
 		detach_mnt(mnt, &old_nd);
 		spin_unlock(&vfsmount_lock);
 		path_release(&old_nd);
_