diff options
| -rw-r--r-- | fs/configfs/dir.c | 37 |
1 files changed, 26 insertions, 11 deletions
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c index 5638c8f..810c139 100644 --- a/fs/configfs/dir.c +++ b/fs/configfs/dir.c @@ -704,13 +704,18 @@ static int configfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) struct module *owner; char *name; - if (dentry->d_parent == configfs_sb->s_root) - return -EPERM; + if (dentry->d_parent == configfs_sb->s_root) { + ret = -EPERM; + goto out; + } sd = dentry->d_parent->d_fsdata; - if (!(sd->s_type & CONFIGFS_USET_DIR)) - return -EPERM; + if (!(sd->s_type & CONFIGFS_USET_DIR)) { + ret = -EPERM; + goto out; + } + /* Get a working ref for the duration of this function */ parent_item = configfs_get_config_item(dentry->d_parent); type = parent_item->ci_type; subsys = to_config_group(parent_item)->cg_subsys; @@ -719,15 +724,16 @@ static int configfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) if (!type || !type->ct_group_ops || (!type->ct_group_ops->make_group && !type->ct_group_ops->make_item)) { - config_item_put(parent_item); - return -EPERM; /* What lack-of-mkdir returns */ + ret = -EPERM; /* Lack-of-mkdir returns -EPERM */ + goto out_put; } name = kmalloc(dentry->d_name.len + 1, GFP_KERNEL); if (!name) { - config_item_put(parent_item); - return -ENOMEM; + ret = -ENOMEM; + goto out_put; } + snprintf(name, dentry->d_name.len + 1, "%s", dentry->d_name.name); down(&subsys->su_sem); @@ -748,8 +754,8 @@ static int configfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) kfree(name); if (!item) { - config_item_put(parent_item); - return -ENOMEM; + ret = -ENOMEM; + goto out_put; } ret = -EINVAL; @@ -776,12 +782,19 @@ static int configfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) client_drop_item(parent_item, item); up(&subsys->su_sem); - config_item_put(parent_item); module_put(owner); } } } +out_put: + /* + * link_obj()/link_group() took a reference from child->parent. + * Drop our working ref + */ + config_item_put(parent_item); + +out: return ret; } @@ -801,6 +814,7 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry) if (sd->s_type & CONFIGFS_USET_DEFAULT) return -EPERM; + /* Get a working ref until we have the child */ parent_item = configfs_get_config_item(dentry->d_parent); subsys = to_config_group(parent_item)->cg_subsys; BUG_ON(!subsys); @@ -817,6 +831,7 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry) return ret; } + /* Get a working ref for the duration of this function */ item = configfs_get_config_item(dentry); /* Drop reference from above, item already holds one. */ |
