Subject: CVE-2024-38593: net: micrel: Fix receiving the timestamp in the frame for lan8841

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

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

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

net: micrel: Fix receiving the timestamp in the frame for lan8841

The blamed commit started to use the ptp workqueue to get the second
part of the timestamp. And when the port was set down, then this
workqueue is stopped. But if the config option NETWORK_PHY_TIMESTAMPING
is not enabled, then the ptp_clock is not initialized so then it would
crash when it would try to access the delayed work.
So then basically by setting up and then down the port, it would crash.
The fix consists in checking if the ptp_clock is initialized and only
then cancel the delayed work.

The Linux kernel CVE team has assigned CVE-2024-38593 to this issue.

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

	Issue introduced in 6.5 with commit cc7554954848 and fixed in 6.6.33 with commit 3ddf170e4a60
	Issue introduced in 6.5 with commit cc7554954848 and fixed in 6.8.12 with commit 3fd4282d5f25
	Issue introduced in 6.5 with commit cc7554954848 and fixed in 6.9.3 with commit 64a47cf634ae
	Issue introduced in 6.5 with commit cc7554954848 and fixed in 6.10 with commit aea27a92a41d

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-2024-38593
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/net/phy/micrel.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/3ddf170e4a604f5d4d9459a36993f5e92b53e8b0
	https://git.kernel.org/stable/c/3fd4282d5f25c3c97fef3ef0b89b82ef4e2bc975
	https://git.kernel.org/stable/c/64a47cf634ae44e92be24ebc982410841093bd7b
	https://git.kernel.org/stable/c/aea27a92a41dae14843f92c79e9e42d8f570105c