linux-cve-announce - CVE-2022-49047: ep93xx: clock: Fix UAF in ep93xx_clk_register

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Message-ID: <2025022651-CVE-2022-49047-fbc3@gregkh>
Date: Wed, 26 Feb 2025 02:54:12 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49047: ep93xx: clock: Fix UAF in ep93xx_clk_register_gate()

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

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

ep93xx: clock: Fix UAF in ep93xx_clk_register_gate()

arch/arm/mach-ep93xx/clock.c:154:2: warning: Use of memory after it is freed [clang-analyzer-unix.Malloc]
arch/arm/mach-ep93xx/clock.c:151:2: note: Taking true branch
if (IS_ERR(clk))
^
arch/arm/mach-ep93xx/clock.c:152:3: note: Memory is released
kfree(psc);
^~~~~~~~~~
arch/arm/mach-ep93xx/clock.c:154:2: note: Use of memory after it is freed
return &psc->hw;
^ ~~~~~~~~

The Linux kernel CVE team has assigned CVE-2022-49047 to this issue.


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

	Issue introduced in 5.16 with commit 9645ccc7bd7a16cd73c3be9dee70cd702b03be37 and fixed in 5.17.4 with commit 0f12166872da46c6b57ba2f1314bbf310b3bf017
	Issue introduced in 5.16 with commit 9645ccc7bd7a16cd73c3be9dee70cd702b03be37 and fixed in 5.18 with commit 3b68b08885217abd9c57ff9b3bb3eb173eee02a9

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-2022-49047
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/arm/mach-ep93xx/clock.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/0f12166872da46c6b57ba2f1314bbf310b3bf017
	https://git.kernel.org/stable/c/3b68b08885217abd9c57ff9b3bb3eb173eee02a9