linux-cve-announce - CVE-2022-50415: parisc: led: Fix potential null-ptr-deref in start

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Message-ID: <2025091854-CVE-2022-50415-9bba@gregkh>
Date: Thu, 18 Sep 2025 18:04:05 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50415: parisc: led: Fix potential null-ptr-deref in start_task()

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

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

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

parisc: led: Fix potential null-ptr-deref in start_task()

start_task() calls create_singlethread_workqueue() and not checked the
ret value, which may return NULL. And a null-ptr-deref may happen:

start_task()
    create_singlethread_workqueue() # failed, led_wq is NULL
    queue_delayed_work()
        queue_delayed_work_on()
            __queue_delayed_work()  # warning here, but continue
                __queue_work()      # access wq->flags, null-ptr-deref

Check the ret value and return -ENOMEM if it is NULL.

The Linux kernel CVE team has assigned CVE-2022-50415 to this issue.


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

	Issue introduced in 2.6.15 with commit 3499495205a676d85fcc2f3c28e35ec9b43c47e3 and fixed in 4.9.337 with commit c6db0c32f39684c89c97bc1ba1c9c4249ca09e48
	Issue introduced in 2.6.15 with commit 3499495205a676d85fcc2f3c28e35ec9b43c47e3 and fixed in 4.14.303 with commit fc6d0f65f22040c6cc8a5ce032bf90252629de50
	Issue introduced in 2.6.15 with commit 3499495205a676d85fcc2f3c28e35ec9b43c47e3 and fixed in 4.19.270 with commit fc307b2905a3dd75c50a53b4d87ac9c912fb7c4e
	Issue introduced in 2.6.15 with commit 3499495205a676d85fcc2f3c28e35ec9b43c47e3 and fixed in 5.4.229 with commit 5e4500454d75dd249be4695d83afa3ba0724c37e
	Issue introduced in 2.6.15 with commit 3499495205a676d85fcc2f3c28e35ec9b43c47e3 and fixed in 5.10.163 with commit 3505c187b86136250b39e62c72a3a70435277af6
	Issue introduced in 2.6.15 with commit 3499495205a676d85fcc2f3c28e35ec9b43c47e3 and fixed in 5.15.87 with commit ac838c663ba1fd6bff35a817fd89a47ab55e88e0
	Issue introduced in 2.6.15 with commit 3499495205a676d85fcc2f3c28e35ec9b43c47e3 and fixed in 6.0.18 with commit 77f8b628affaec692d83ad8bfa3520db8a0cc493
	Issue introduced in 2.6.15 with commit 3499495205a676d85fcc2f3c28e35ec9b43c47e3 and fixed in 6.1.4 with commit 67c98fec87ed76b1feb2ae810051afd88dfa9df6
	Issue introduced in 2.6.15 with commit 3499495205a676d85fcc2f3c28e35ec9b43c47e3 and fixed in 6.2 with commit 41f563ab3c33698bdfc3403c7c2e6c94e73681e4

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-2022-50415
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/parisc/led.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/c6db0c32f39684c89c97bc1ba1c9c4249ca09e48
	https://git.kernel.org/stable/c/fc6d0f65f22040c6cc8a5ce032bf90252629de50
	https://git.kernel.org/stable/c/fc307b2905a3dd75c50a53b4d87ac9c912fb7c4e
	https://git.kernel.org/stable/c/5e4500454d75dd249be4695d83afa3ba0724c37e
	https://git.kernel.org/stable/c/3505c187b86136250b39e62c72a3a70435277af6
	https://git.kernel.org/stable/c/ac838c663ba1fd6bff35a817fd89a47ab55e88e0
	https://git.kernel.org/stable/c/77f8b628affaec692d83ad8bfa3520db8a0cc493
	https://git.kernel.org/stable/c/67c98fec87ed76b1feb2ae810051afd88dfa9df6
	https://git.kernel.org/stable/c/41f563ab3c33698bdfc3403c7c2e6c94e73681e4