Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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()
+14
+14
fs/configfs/dir.c
+14
fs/configfs/dir.c
···
34
34
*/
35
35
DEFINE_SPINLOCK(configfs_dirent_lock);
36
36
37
+
/*
38
+
* All of link_obj/unlink_obj/link_group/unlink_group require that
39
+
* subsys->su_mutex is held.
40
+
* But parent configfs_subsystem is NULL when config_item is root.
41
+
* Use this mutex when config_item is root.
42
+
*/
43
+
static DEFINE_MUTEX(configfs_subsystem_mutex);
44
+
37
45
static void configfs_d_iput(struct dentry * dentry,
38
46
struct inode * inode)
39
47
{
···
1867
1859
group->cg_item.ci_name = group->cg_item.ci_namebuf;
1868
1860
1869
1861
sd = root->d_fsdata;
1862
+
mutex_lock(&configfs_subsystem_mutex);
1870
1863
link_group(to_config_group(sd->s_element), group);
1864
+
mutex_unlock(&configfs_subsystem_mutex);
1871
1865
1872
1866
inode_lock_nested(d_inode(root), I_MUTEX_PARENT);
1873
1867
···
1894
1884
inode_unlock(d_inode(root));
1895
1885
1896
1886
if (err) {
1887
+
mutex_lock(&configfs_subsystem_mutex);
1897
1888
unlink_group(group);
1889
+
mutex_unlock(&configfs_subsystem_mutex);
1898
1890
configfs_release_fs();
1899
1891
}
1900
1892
put_fragment(frag);
···
1943
1931
1944
1932
dput(dentry);
1945
1933
1934
+
mutex_lock(&configfs_subsystem_mutex);
1946
1935
unlink_group(group);
1936
+
mutex_unlock(&configfs_subsystem_mutex);
1947
1937
configfs_release_fs();
1948
1938
}
1949
1939