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configfs fix for Linux 5.17

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- fix a race in configfs_{,un}register_subsystem (ChenXiaoSong)
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Merge tag 'configfs-5.17-2022-02-25' of git://git.infradead.org/users/hch/configfs

Pull configfs fix from Christoph Hellwig:

 - fix a race in configfs_{,un}register_subsystem (ChenXiaoSong)

* tag 'configfs-5.17-2022-02-25' of git://git.infradead.org/users/hch/configfs:
  configfs: fix a race in configfs_{,un}register_subsystem()
This commit is contained in:
Linus Torvalds 2022-02-25 14:12:36 -08:00
commit 9137eda537
1 changed files with 14 additions and 0 deletions
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14
fs/configfs/dir.c
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@ -34,6 +34,14 @@
*/
DEFINE_SPINLOCK(configfs_dirent_lock);
/*
* All of link_obj/unlink_obj/link_group/unlink_group require that
* subsys->su_mutex is held.
* But parent configfs_subsystem is NULL when config_item is root.
* Use this mutex when config_item is root.
*/
static DEFINE_MUTEX(configfs_subsystem_mutex);
static void configfs_d_iput(struct dentry * dentry,
struct inode * inode)
{
@ -1859,7 +1867,9 @@ int configfs_register_subsystem(struct configfs_subsystem *subsys)
group->cg_item.ci_name = group->cg_item.ci_namebuf;
sd = root->d_fsdata;
mutex_lock(&configfs_subsystem_mutex);
link_group(to_config_group(sd->s_element), group);
mutex_unlock(&configfs_subsystem_mutex);
inode_lock_nested(d_inode(root), I_MUTEX_PARENT);
@ -1884,7 +1894,9 @@ int configfs_register_subsystem(struct configfs_subsystem *subsys)
inode_unlock(d_inode(root));
if (err) {
mutex_lock(&configfs_subsystem_mutex);
unlink_group(group);
mutex_unlock(&configfs_subsystem_mutex);
configfs_release_fs();
}
put_fragment(frag);
@ -1931,7 +1943,9 @@ void configfs_unregister_subsystem(struct configfs_subsystem *subsys)
dput(dentry);
mutex_lock(&configfs_subsystem_mutex);
unlink_group(group);
mutex_unlock(&configfs_subsystem_mutex);
configfs_release_fs();
}