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-rw-r--r--fs/namespace.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index 29b70669435c..34156260c9b6 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1334,8 +1334,12 @@ asmlinkage long sys_pivot_root(const char __user *new_root, const char __user *p
error = -EINVAL;
if (user_nd.mnt->mnt_root != user_nd.dentry)
goto out2; /* not a mountpoint */
+ if (user_nd.mnt->mnt_parent == user_nd.mnt)
+ goto out2; /* not attached */
if (new_nd.mnt->mnt_root != new_nd.dentry)
goto out2; /* not a mountpoint */
+ if (new_nd.mnt->mnt_parent == new_nd.mnt)
+ goto out2; /* not attached */
tmp = old_nd.mnt; /* make sure we can reach put_old from new_root */
spin_lock(&vfsmount_lock);
if (tmp != new_nd.mnt) {