diff options
Diffstat (limited to 'fs/sysfs')
| -rw-r--r-- | fs/sysfs/group.c | 30 |
1 files changed, 22 insertions, 8 deletions
diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c index c7a716c4acc9..1eb2d6307663 100644 --- a/fs/sysfs/group.c +++ b/fs/sysfs/group.c @@ -124,13 +124,22 @@ static int internal_create_group(struct kobject *kobj, int update, } kobject_get_ownership(kobj, &uid, &gid); if (grp->name) { - kn = kernfs_create_dir_ns(kobj->sd, grp->name, - S_IRWXU | S_IRUGO | S_IXUGO, - uid, gid, kobj, NULL); - if (IS_ERR(kn)) { - if (PTR_ERR(kn) == -EEXIST) - sysfs_warn_dup(kobj->sd, grp->name); - return PTR_ERR(kn); + if (update) { + kn = kernfs_find_and_get(kobj->sd, grp->name); + if (!kn) { + pr_warn("Can't update unknown attr grp name: %s/%s\n", + kobj->name, grp->name); + return -EINVAL; + } + } else { + kn = kernfs_create_dir_ns(kobj->sd, grp->name, + S_IRWXU | S_IRUGO | S_IXUGO, + uid, gid, kobj, NULL); + if (IS_ERR(kn)) { + if (PTR_ERR(kn) == -EEXIST) + sysfs_warn_dup(kobj->sd, grp->name); + return PTR_ERR(kn); + } } } else kn = kobj->sd; @@ -141,6 +150,10 @@ static int internal_create_group(struct kobject *kobj, int update, kernfs_remove(kn); } kernfs_put(kn); + + if (grp->name && update) + kernfs_put(kn); + return error; } @@ -205,7 +218,8 @@ EXPORT_SYMBOL_GPL(sysfs_create_groups); * of the attribute files being created already exist. Furthermore, * if the visibility of the files has changed through the is_visible() * callback, it will update the permissions and add or remove the - * relevant files. + * relevant files. Changing a group's name (subdirectory name under + * kobj's directory in sysfs) is not allowed. * * The primary use for this function is to call it after making a change * that affects group visibility. |