From: Tejun Heo tj@kernel.org
commit e23f568aa63f64cd6b355094224cc9356c0f696b upstream.
When the 32bit ino wraps around, kernfs increments the generation number to distinguish reused ino instances. The wrap-around detection tests whether the allocated ino is lower than what the cursor but the cursor is pointing to the next ino to allocate so the condition never triggers.
Fix it by remembering the last ino and comparing against that.
Signed-off-by: Tejun Heo tj@kernel.org Reviewed-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Fixes: 4a3ef68acacf ("kernfs: implement i_generation") Cc: Namhyung Kim namhyung@kernel.org Cc: stable@vger.kernel.org # v4.14+ Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/kernfs/dir.c | 5 ++--- include/linux/kernfs.h | 1 + 2 files changed, 3 insertions(+), 3 deletions(-)
--- a/fs/kernfs/dir.c +++ b/fs/kernfs/dir.c @@ -621,7 +621,6 @@ static struct kernfs_node *__kernfs_new_ { struct kernfs_node *kn; u32 gen; - int cursor; int ret;
name = kstrdup_const(name, GFP_KERNEL); @@ -634,11 +633,11 @@ static struct kernfs_node *__kernfs_new_
idr_preload(GFP_KERNEL); spin_lock(&kernfs_idr_lock); - cursor = idr_get_cursor(&root->ino_idr); ret = idr_alloc_cyclic(&root->ino_idr, kn, 1, 0, GFP_ATOMIC); - if (ret >= 0 && ret < cursor) + if (ret >= 0 && ret < root->last_ino) root->next_generation++; gen = root->next_generation; + root->last_ino = ret; spin_unlock(&kernfs_idr_lock); idr_preload_end(); if (ret < 0) --- a/include/linux/kernfs.h +++ b/include/linux/kernfs.h @@ -187,6 +187,7 @@ struct kernfs_root {
/* private fields, do not use outside kernfs proper */ struct idr ino_idr; + u32 last_ino; u32 next_generation; struct kernfs_syscall_ops *syscall_ops;