[PATCH] vfs: Fix dup_mnt_ns

[Sasha Levin]

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@xxxxxxxxx>
---
 fs/namespace.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index 5a6208b..224aff1 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);
-- 
1.7.8.4

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