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configs updates for Linux 5.2: 

- a fix for an error path use after free (YueHaibing)
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Merge tag 'configfs-for-5.2' of git://git.infradead.org/users/hch/configfs

Pull configfs update from Christoph Hellwig:

 - a fix for an error path use after free (YueHaibing)

* tag 'configfs-for-5.2' of git://git.infradead.org/users/hch/configfs:
  configfs: fix possible use-after-free in configfs_register_group
This commit is contained in:
Linus Torvalds 2019-05-16 11:46:58 -07:00
parent 27ebbf9d5b 35399f87e2
commit 4e785e8d99
1 changed files with 12 additions and 5 deletions
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17
fs/configfs/dir.c
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@ -1757,12 +1757,19 @@ int configfs_register_group(struct config_group *parent_group,
inode_lock_nested(d_inode(parent), I_MUTEX_PARENT); inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
ret = create_default_group(parent_group, group); ret = create_default_group(parent_group, group);
if (!ret) { if (ret)
spin_lock(&configfs_dirent_lock); goto err_out;
configfs_dir_set_ready(group->cg_item.ci_dentry->d_fsdata);
spin_unlock(&configfs_dirent_lock); spin_lock(&configfs_dirent_lock);
} configfs_dir_set_ready(group->cg_item.ci_dentry->d_fsdata);
spin_unlock(&configfs_dirent_lock);
inode_unlock(d_inode(parent)); inode_unlock(d_inode(parent));
return 0;
err_out:
inode_unlock(d_inode(parent));
mutex_lock(&subsys->su_mutex);
unlink_group(group);
mutex_unlock(&subsys->su_mutex);
return ret; return ret;
} }
EXPORT_SYMBOL(configfs_register_group); EXPORT_SYMBOL(configfs_register_group);