1 files changed, 6 insertions, 2 deletions

diff --git a/fs/namespace.c b/fs/namespace.c
index 2dd333b0fe7f..6645846f2056 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2246,10 +2246,14 @@ void __init mnt_init(void)
         init_mount_tree();
 }
 
-void __put_mnt_ns(struct mnt_namespace *ns)
+void put_mnt_ns(struct mnt_namespace *ns)
 {
-        struct vfsmount *root = ns->root;
+        struct vfsmount *root;
         LIST_HEAD(umount_list);
+
+        if (!atomic_dec_and_lock(&ns->count, &vfsmount_lock))
+                return;
+        root = ns->root;
         ns->root = NULL;
         spin_unlock(&vfsmount_lock);
         down_write(&namespace_sem);