tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernfs: Acquire kernfs_rwsem in kernfs_get_parent_dentry().

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>

authored by

Sebastian Andrzej Siewior and committed by
Greg Kroah-Hartman 122ab92d 400188ae

+2
+2
fs/kernfs/mount.c
··· 145 145 static struct dentry *kernfs_get_parent_dentry(struct dentry *child) 146 146 { 147 147 struct kernfs_node *kn = kernfs_dentry_node(child); 148 + struct kernfs_root *root = kernfs_root(kn); 148 149 150 + guard(rwsem_read)(&root->kernfs_rwsem); 149 151 return d_obtain_alias(kernfs_get_inode(child->d_sb, kn->parent)); 150 152 } 151 153