diff options
| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2025-02-13 15:50:20 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-15 17:46:32 +0100 |
| commit | 5b2fabf7fe8f745ff214ff003e6067b64f172271 (patch) | |
| tree | 405da8cf4b799ab4eb890de892b42c59d2936fa7 /fs/kernfs | |
| parent | 122ab92dee80582c39740609a627198dd5b6b595 (diff) | |
kernfs: Acquire kernfs_rwsem in kernfs_node_dentry().
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>
Diffstat (limited to 'fs/kernfs')
| -rw-r--r-- | fs/kernfs/mount.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c index b9b16e97bff1..4a0ff08d589c 100644 --- a/fs/kernfs/mount.c +++ b/fs/kernfs/mount.c @@ -209,6 +209,7 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn, { struct dentry *dentry; struct kernfs_node *knparent; + struct kernfs_root *root; BUG_ON(sb->s_op != &kernfs_sops); @@ -218,6 +219,9 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn, if (!kn->parent) return dentry; + root = kernfs_root(kn); + guard(rwsem_read)(&root->kernfs_rwsem); + knparent = find_next_ancestor(kn, NULL); if (WARN_ON(!knparent)) { dput(dentry); |