CVE-2022-49136: Bluetooth: hci_sync: Fix queuing commands when HCI_UNREGISTER is set

CVE-2022-49136: Bluetooth: hci_sync: Fix queuing commands when HCI_UNREGISTER is set

[Greg Kroah-Hartman]

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

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

Bluetooth: hci_sync: Fix queuing commands when HCI_UNREGISTER is set

hci_cmd_sync_queue shall return an error if HCI_UNREGISTER flag has
been set as that means hci_unregister_dev has been called so it will
likely cause a uaf after the timeout as the hdev will be freed.

The Linux kernel CVE team has assigned CVE-2022-49136 to this issue.


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

	Fixed in 5.17.3 with commit 1c69ef84a808676cceb69210addf5df45b741323
	Fixed in 5.18 with commit 0b94f2651f56b9e4aa5f012b0d7eb57308c773cf

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-2022-49136
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:
	net/bluetooth/hci_sync.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/1c69ef84a808676cceb69210addf5df45b741323
	https://git.kernel.org/stable/c/0b94f2651f56b9e4aa5f012b0d7eb57308c773cf