diff --git a/fs/namespace.c b/fs/namespace.c
index 2b12b7a9455d0b60bc6a0498c18264090321a3d1..acc5583764dc0925ad2f4745824d3848b743e978 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1669,8 +1669,11 @@ struct vfsmount *collect_mounts(struct path *path)
 {
 	struct mount *tree;
 	namespace_lock();
-	tree = copy_tree(real_mount(path->mnt), path->dentry,
-			 CL_COPY_ALL | CL_PRIVATE);
+	if (!check_mnt(real_mount(path->mnt)))
+		tree = ERR_PTR(-EINVAL);
+	else
+		tree = copy_tree(real_mount(path->mnt), path->dentry,
+				 CL_COPY_ALL | CL_PRIVATE);
 	namespace_unlock();
 	if (IS_ERR(tree))
 		return ERR_CAST(tree);