Re: [PATCH] configfs: Fix config_item refcnt error in __configfs_open_file()

From: Christoph Hellwig
Date: Thu Mar 11 2021 - 06:17:24 EST


I've actually just queued up a similar patch from Daiyue Zhang.

> - goto out_put_item;
> + goto out_put_module;
>
> if (type & CONFIGFS_ITEM_BIN_ATTR) {
> buffer->bin_attr = to_bin_attr(dentry);
> @@ -391,7 +391,7 @@ static int __configfs_open_file(struct inode *inode, struct file *file, int type
> /* Grab the module reference for this attribute if we have one */
> error = -ENODEV;
> if (!try_module_get(buffer->owner))
> - goto out_put_item;
> + goto out_put_module;
>
> error = -EACCES;
> if (!buffer->item->ci_type)
> @@ -435,8 +435,6 @@ static int __configfs_open_file(struct inode *inode, struct file *file, int type
>
> out_put_module:
> module_put(buffer->owner);
> -out_put_item:
> - config_item_put(buffer->item);
> out_free_buffer:

But the goto labe changes here look incorrect anyway, as they now introduce
a double put on the module..