Subject: CVE-2024-42137: Bluetooth: qca: Fix BT enable failure again for QCA6390 after warm reboot

From: Greg Kroah-Hartman <[email-masked]>

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

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

Bluetooth: qca: Fix BT enable failure again for QCA6390 after warm reboot

Commit 272970be3dab ("Bluetooth: hci_qca: Fix driver shutdown on closed
serdev") will cause below regression issue:

BT can't be enabled after below steps:
cold boot -> enable BT -> disable BT -> warm reboot -> BT enable failure
if property enable-gpios is not configured within DT|ACPI for QCA6390.

The commit is to fix a use-after-free issue within qca_serdev_shutdown()
by adding condition to avoid the serdev is flushed or wrote after closed
but also introduces this regression issue regarding above steps since the
VSC is not sent to reset controller during warm reboot.

Fixed by sending the VSC to reset controller within qca_serdev_shutdown()
once BT was ever enabled, and the use-after-free issue is also fixed by
this change since the serdev is still opened before it is flushed or wrote.

Verified by the reported machine Dell XPS 13 9310 laptop over below two
kernel commits:
commit e00fc2700a3f ("Bluetooth: btusb: Fix triggering coredump
implementation for QCA") of bluetooth-next tree.
commit b23d98d46d28 ("Bluetooth: btusb: Fix triggering coredump
implementation for QCA") of linus mainline tree.

The Linux kernel CVE team has assigned CVE-2024-42137 to this issue.

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

	Issue introduced in 5.10.165 with commit e84ec6e25df9 and fixed in 5.10.222 with commit 215a26c2404f
	Issue introduced in 5.15.90 with commit 908d1742b6e6 and fixed in 5.15.163 with commit 4ca6013cd18e
	Issue introduced in 6.1.8 with commit ea3ebda47dd5 and fixed in 6.1.98 with commit e6e200b26427
	Issue introduced in 6.2 with commit 272970be3dab and fixed in 6.6.39 with commit e2d8aa4c7635
	Issue introduced in 6.2 with commit 272970be3dab and fixed in 6.9.9 with commit 977b9dc65e14
	Issue introduced in 6.2 with commit 272970be3dab and fixed in 6.10 with commit 88e72239ead9

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-2024-42137
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:
	drivers/bluetooth/hci_qca.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/215a26c2404fa34625c725d446967fa328a703eb
	https://git.kernel.org/stable/c/4ca6013cd18e58ac1044908c40d4006a92093a11
	https://git.kernel.org/stable/c/e6e200b264271f62a3fadb51ada9423015ece37b
	https://git.kernel.org/stable/c/e2d8aa4c763593704ac21e7591aed4f13e32f3b5
	https://git.kernel.org/stable/c/977b9dc65e14fb80de4763d949c7dec2ecb15b9b
	https://git.kernel.org/stable/c/88e72239ead9814b886db54fc4ee39ef3c2b8f26