CVE-2022-49469: btrfs: fix anon_dev leak in create_subvol()

CVE-2022-49469: btrfs: fix anon_dev leak in create_subvol()

[Greg Kroah-Hartman]

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix anon_dev leak in create_subvol()

When btrfs_qgroup_inherit(), btrfs_alloc_tree_block, or
btrfs_insert_root() fail in create_subvol(), we return without freeing
anon_dev. Reorganize the error handling in create_subvol() to fix this.

The Linux kernel CVE team has assigned CVE-2022-49469 to this issue.


Affected and fixed versions
===========================

	Fixed in 5.17.14 with commit d887b3de318834f9aa637ecf79c6bc66cba7c69a
	Fixed in 5.18.3 with commit 7a875ad8706f0903a0e812e0dd701956ee9826ff
	Fixed in 5.19 with commit 2256e901f5bddc56e24089c96f27b77da932dfcc

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2022-49469
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	fs/btrfs/ioctl.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/d887b3de318834f9aa637ecf79c6bc66cba7c69a
	https://git.kernel.org/stable/c/7a875ad8706f0903a0e812e0dd701956ee9826ff
	https://git.kernel.org/stable/c/2256e901f5bddc56e24089c96f27b77da932dfcc