btrfs: fix uninitialized pointer free in add_inode_ref()

stable inclusion
from stable-v6.6.58
commit e11ce03b58743bf1e096c48fcaa7e6f08eb75dfa
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IB0EMU
CVE: CVE-2024-50088

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e11ce03b58743bf1e096c48fcaa7e6f08eb75dfa



--------------------------------

commit 66691c6e2f18d2aa4b22ffb624b9bdc97e9979e4 upstream.

The add_inode_ref() function does not initialize the "name" struct when
it is declared.  If any of the following calls to "read_one_inode()
returns NULL,

	dir = read_one_inode(root, parent_objectid);
	if (!dir) {
		ret = -ENOENT;
		goto out;
	}

	inode = read_one_inode(root, inode_objectid);
	if (!inode) {
		ret = -EIO;
		goto out;
	}

then "name.name" would be freed on "out" before being initialized.

out:
	...
	kfree(name.name);

This issue was reported by Coverity with CID 1526744.

Fixes: e43eec81 ("btrfs: use struct qstr instead of name and namelen pairs")
CC: stable@vger.kernel.org # 6.6+
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Roi Martin <jroi.martin@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Yifan Qiao <qiaoyifan4@huawei.com>