CVE-2025-71303: accel/amdxdna: Fix race condition when checking rpm_on

CVE-2025-71303: accel/amdxdna: Fix race condition when checking rpm_on

[Greg Kroah-Hartman]

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

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

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

accel/amdxdna: Fix race condition when checking rpm_on

When autosuspend is triggered, driver rpm_on flag is set to indicate that
a suspend/resume is already in progress. However, when a userspace
application submits a command during this narrow window,
amdxdna_pm_resume_get() may incorrectly skip the resume operation because
the rpm_on flag is still set. This results in commands being submitted
while the device has not actually resumed, causing unexpected behavior.

The set_dpm() is called by suspend/resume, it relied on rpm_on flag to
avoid calling into rpm suspend/resume recursivly. So to fix this, remove
the use of the rpm_on flag entirely. Instead, introduce aie2_pm_set_dpm()
which explicitly resumes the device before invoking set_dpm(). With this
change, set_dpm() is called directly inside the suspend or resume execution
path. Otherwise, aie2_pm_set_dpm() is called.

The Linux kernel CVE team has assigned CVE-2025-71303 to this issue.


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

	Issue introduced in 6.19 with commit 063db451832b8849faf1b0b8404b3a6a39995b29 and fixed in 6.19.4 with commit e7cb75b6a5127d78298e39750b4f3185eca0dafc
	Issue introduced in 6.19 with commit 063db451832b8849faf1b0b8404b3a6a39995b29 and fixed in 7.0 with commit 00ffe45ece80160aef446d74ded906352f21dd72

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-2025-71303
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/accel/amdxdna/aie2_message.c
	drivers/accel/amdxdna/aie2_pci.c
	drivers/accel/amdxdna/aie2_pci.h
	drivers/accel/amdxdna/aie2_pm.c
	drivers/accel/amdxdna/aie2_smu.c
	drivers/accel/amdxdna/amdxdna_pci_drv.h
	drivers/accel/amdxdna/amdxdna_pm.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/e7cb75b6a5127d78298e39750b4f3185eca0dafc
	https://git.kernel.org/stable/c/00ffe45ece80160aef446d74ded906352f21dd72