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kernfs: Acquire kernfs_rwsem in kernfs_node_dentry().

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kernfs_node_dentry() passes kernfs_node::name to
lookup_positive_unlocked().

Acquire kernfs_root::kernfs_rwsem to ensure the node is not renamed
during the operation.

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20250213145023.2820193-4-bigeasy@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sebastian Andrzej Siewior 2025-02-13 15:50:20 +01:00 committed by Greg Kroah-Hartman
parent 122ab92dee
commit 5b2fabf7fe
1 changed files with 4 additions and 0 deletions
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4
fs/kernfs/mount.c
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@ -209,6 +209,7 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn,
{ {
struct dentry *dentry; struct dentry *dentry;
struct kernfs_node *knparent; struct kernfs_node *knparent;
struct kernfs_root *root;
BUG_ON(sb->s_op != &kernfs_sops); BUG_ON(sb->s_op != &kernfs_sops);
@ -218,6 +219,9 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn,
if (!kn->parent) if (!kn->parent)
return dentry; return dentry;
root = kernfs_root(kn);
guard(rwsem_read)(&root->kernfs_rwsem);
knparent = find_next_ancestor(kn, NULL); knparent = find_next_ancestor(kn, NULL);
if (WARN_ON(!knparent)) { if (WARN_ON(!knparent)) {
dput(dentry); dput(dentry);