linux-cve-announce - CVE-2022-50830: auxdisplay: hd44780: Fix potential memory leak in hd44780

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2025123016-CVE-2022-50830-ea74@gregkh>
Date: Tue, 30 Dec 2025 13:13:16 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50830: auxdisplay: hd44780: Fix potential memory leak in hd44780_remove()

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

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

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

auxdisplay: hd44780: Fix potential memory leak in hd44780_remove()

hd44780_probe() allocates a memory chunk for hd with kzalloc() and
makes "lcd->drvdata->hd44780" point to it. When we call hd44780_remove(),
we should release all relevant memory and resource. But "lcd->drvdata
->hd44780" is not released, which will lead to a memory leak.

We should release the "lcd->drvdata->hd44780" in hd44780_remove() to fix
the memory leak bug.

The Linux kernel CVE team has assigned CVE-2022-50830 to this issue.


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

	Issue introduced in 5.11 with commit 718e05ed92ecac0d9d3954bcc8064527c3ce7565 and fixed in 5.15.100 with commit 8311961a1724bfc64390c539dedc31e067a80315
	Issue introduced in 5.11 with commit 718e05ed92ecac0d9d3954bcc8064527c3ce7565 and fixed in 6.1.18 with commit 6cd37f8232f5e169a723e1d5fbe3b2139c2ef763
	Issue introduced in 5.11 with commit 718e05ed92ecac0d9d3954bcc8064527c3ce7565 and fixed in 6.2.5 with commit 5d407911e605702ffcc0e97a6db546592ab27dd0
	Issue introduced in 5.11 with commit 718e05ed92ecac0d9d3954bcc8064527c3ce7565 and fixed in 6.3 with commit ddf75a86aba2cfb7ec4497e8692b60c8c8fe0ee7

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-2022-50830
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/auxdisplay/hd44780.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/8311961a1724bfc64390c539dedc31e067a80315
	https://git.kernel.org/stable/c/6cd37f8232f5e169a723e1d5fbe3b2139c2ef763
	https://git.kernel.org/stable/c/5d407911e605702ffcc0e97a6db546592ab27dd0
	https://git.kernel.org/stable/c/ddf75a86aba2cfb7ec4497e8692b60c8c8fe0ee7