linux-cve-announce - CVE-2022-50518: parisc: Fix locking in pdc_iodc

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Message-ID: <2025100703-CVE-2022-50518-0bf9@gregkh>
Date: Tue,  7 Oct 2025 17:19:05 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50518: parisc: Fix locking in pdc_iodc_print() firmware call

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

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

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

parisc: Fix locking in pdc_iodc_print() firmware call

Utilize pdc_lock spinlock to protect parallel modifications of the
iodc_dbuf[] buffer, check length to prevent buffer overflow of
iodc_dbuf[], drop the iodc_retbuf[] buffer and fix some wrong
indentings.

The Linux kernel CVE team has assigned CVE-2022-50518 to this issue.


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

	Fixed in 6.0.18 with commit 04a603058e70b8b881bb7860b8bd649f931f2591
	Fixed in 6.1.4 with commit 553bc5890ed96a8d006224c3a4673c47fee0d12a
	Fixed in 6.2 with commit 7236aae5f81f3efbd93d0601e74fc05994bc2580

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-2022-50518
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:
	arch/parisc/kernel/firmware.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/04a603058e70b8b881bb7860b8bd649f931f2591
	https://git.kernel.org/stable/c/553bc5890ed96a8d006224c3a4673c47fee0d12a
	https://git.kernel.org/stable/c/7236aae5f81f3efbd93d0601e74fc05994bc2580