CVE-2025-71307: drm/panthor: Fix NULL pointer dereference on panthor_fw_unplug

CVE-2025-71307: drm/panthor: Fix NULL pointer dereference on panthor_fw_unplug

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

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

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

drm/panthor: Fix NULL pointer dereference on panthor_fw_unplug

This patch removes the MCU halt and wait for halt procedures during
panthor_fw_unplug() as the MCU can be in a variety of states or the FW
may not even be loaded/initialized at all, the latter of which can lead
to a NULL pointer dereference.

It should be safe on unplug to just disable the MCU without waiting for
it to halt as it may not be able to.

The Linux kernel CVE team has assigned CVE-2025-71307 to this issue.


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

	Issue introduced in 6.19 with commit 51407254986501b19681d55531963f1ea58e89cd and fixed in 6.19.4 with commit aab8b8a42e206a399fe3a5ed4b4cbb45ff6c546c
	Issue introduced in 6.19 with commit 51407254986501b19681d55531963f1ea58e89cd and fixed in 7.0 with commit 920c6af98e98e6afedf6318a75bac95af8415c6c

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-2025-71307
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/gpu/drm/panthor/panthor_fw.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/aab8b8a42e206a399fe3a5ed4b4cbb45ff6c546c
	https://git.kernel.org/stable/c/920c6af98e98e6afedf6318a75bac95af8415c6c