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kernfs: Acquire kernfs_rwsem in kernfs_get_parent_dentry().

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kernfs_get_parent_dentry() passes kernfs_node::parent to
kernfs_get_inode().

Acquire kernfs_root::kernfs_rwsem to ensure kernfs_node::parent isn't
replaced 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/20250213145023.2820193-3-bigeasy@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sebastian Andrzej Siewior
2025-02-13 15:50:19 +01:00
committed by Greg Kroah-Hartman
parent 400188ae36
commit 122ab92dee
1 changed files with 2 additions and 0 deletions
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fs/kernfs/mount.c
+2
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@@ -145,7 +145,9 @@ static struct dentry *kernfs_fh_to_parent(struct super_block *sb,
static struct dentry *kernfs_get_parent_dentry(struct dentry *child)
{
struct kernfs_node *kn = kernfs_dentry_node(child);
struct kernfs_root *root = kernfs_root(kn);
guard(rwsem_read)(&root->kernfs_rwsem);
return d_obtain_alias(kernfs_get_inode(child->d_sb, kn->parent));
}