From a67d500eda85fcfde0f73f82b2416d8130f1b9f6 Mon Sep 17 00:00:00 2001
From: Sasha Levin <levinsasha928@gmail.com>
Date: Wed, 21 Mar 2012 10:48:19 +1100
Subject: [PATCH] vfs: fix dup_mnt_ns

Commit f8b88187 ("brlocks/lglocks: cleanups") has accidently dropped the
assignment of the new root into the mnt_fs.

This leads to NULL dereferences since ->root is assumed to be always non-NULL.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 fs/namespace.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/namespace.c b/fs/namespace.c
index 5a6208b2daa9..224aff1c0dfd 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2250,6 +2250,7 @@ static struct mnt_namespace *dup_mnt_ns(struct mnt_namespace *mnt_ns,
 		kfree(new_ns);
 		return ERR_PTR(-ENOMEM);
 	}
+	new_ns->root = new;
 	br_write_lock(&vfsmount_lock);
 	list_add_tail(&new_ns->list, &new->mnt_list);
 	br_write_unlock(&vfsmount_lock);
-- 
2.39.2