Unverified Commit 0c0b0463 authored by Christian Brauner's avatar Christian Brauner
Browse files

mount: start iterating from start of rbtree 

If the root of the namespace has an id that's greater than the child
we'd not find it. Handle that case.

Link: https://patch.msgid.link/20260122-work-fsmount-namespace-v1-1-5ef0a886e646@kernel.org


Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent 1f318b96

fs/namespace.c

+6 −6
Original line number Diff line number Diff line
@@ -5649,14 +5649,14 @@ static int grab_requested_root(struct mnt_namespace *ns, struct path *root) 
	if (mnt_ns_empty(ns))

		return -ENOENT;



	first = child = ns->root;

	for (;;) {

		child = listmnt_next(child, false);

		if (!child)

			return -ENOENT;

		if (child->mnt_parent == first)

	first = ns->root;

	for (child = node_to_mount(ns->mnt_first_node); child;

	     child = listmnt_next(child, false)) {

		if (child != first && child->mnt_parent == first)

			break;

	}

	if (!child)

		return -ENOENT;



	root->mnt = mntget(&child->mnt);

	root->dentry = dget(root->mnt->mnt_root);