CVE-2026-80750: pmdomain: mediatek: fix remaining %pOF after of_node_put()

CVE-2026-80750: pmdomain: mediatek: fix remaining %pOF after of_node_put()

[Greg Kroah-Hartman]

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

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

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

pmdomain: mediatek: fix remaining %pOF after of_node_put()

scpsys_get_bus_protection_legacy() looks up several legacy bus
protection regmaps from device-tree nodes.

Two error paths put the device node before checking whether the regmap
lookup failed, but still pass that node to dev_err_probe() with %pOF on
failure. If of_node_put() drops the last reference, the later %pOF
formatting can dereference a freed device node.

Keep the node reference until after the error message has been emitted in
the infracfg and SMI lookup paths. Also drop the SMI node before
returning when the SMI phandle is missing.

The Linux kernel CVE team has assigned CVE-2026-80750 to this issue.


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

	Issue introduced in 6.18 with commit c29345fa5f66bea0790cf2219f57b974d4fc177b and fixed in 6.18.46 with commit 970b9c83a07c405fdd32bcce7cc4c9e670e58875
	Issue introduced in 6.18 with commit c29345fa5f66bea0790cf2219f57b974d4fc177b and fixed in 7.1.10 with commit 10bf2d7261d7f724ed43a09eea4c90c19c0230a0
	Issue introduced in 6.18 with commit c29345fa5f66bea0790cf2219f57b974d4fc177b and fixed in 7.2 with commit 3e013bc8b941bd52c8e3a99798d0ae8792cb71ca

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-2026-80750
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/pmdomain/mediatek/mtk-pm-domains.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/970b9c83a07c405fdd32bcce7cc4c9e670e58875
	https://git.kernel.org/stable/c/10bf2d7261d7f724ed43a09eea4c90c19c0230a0
	https://git.kernel.org/stable/c/3e013bc8b941bd52c8e3a99798d0ae8792cb71ca