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mount: start iterating from start of rbtree

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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: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2026-01-22 11:48:46 +01:00
parent 1f318b96cc
commit 0c0b046392
1 changed files with 6 additions and 6 deletions
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12
fs/namespace.c
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@@ -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);