linux-cve-announce - CVE-2022-49273: rtc: pl031: fix rtc features null pointer dereference

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Message-ID: <2025022630-CVE-2022-49273-61de@gregkh>
Date: Wed, 26 Feb 2025 02:57:58 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49273: rtc: pl031: fix rtc features null pointer dereference

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

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

rtc: pl031: fix rtc features null pointer dereference

When there is no interrupt line, rtc alarm feature is disabled.

The clearing of the alarm feature bit was being done prior to allocations
of ldata->rtc device, resulting in a null pointer dereference.

Clear RTC_FEATURE_ALARM after the rtc device is allocated.

The Linux kernel CVE team has assigned CVE-2022-49273 to this issue.


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

	Issue introduced in 5.12 with commit d9b0dd54a1943f47a381a474f8ea2c94466110c0 and fixed in 5.15.33 with commit cd2722e411e8ab7e5ae41102f6925fa13dffdac5
	Issue introduced in 5.12 with commit d9b0dd54a1943f47a381a474f8ea2c94466110c0 and fixed in 5.16.19 with commit d274ce4a3dfd0b9a292667535578359b865765cb
	Issue introduced in 5.12 with commit d9b0dd54a1943f47a381a474f8ea2c94466110c0 and fixed in 5.17.2 with commit 1b915703964f7e636961df04c540261dc55c6c70
	Issue introduced in 5.12 with commit d9b0dd54a1943f47a381a474f8ea2c94466110c0 and fixed in 5.18 with commit ea6af39f3da50c86367a71eb3cc674ade3ed244c

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-2022-49273
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/rtc/rtc-pl031.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/cd2722e411e8ab7e5ae41102f6925fa13dffdac5
	https://git.kernel.org/stable/c/d274ce4a3dfd0b9a292667535578359b865765cb
	https://git.kernel.org/stable/c/1b915703964f7e636961df04c540261dc55c6c70
	https://git.kernel.org/stable/c/ea6af39f3da50c86367a71eb3cc674ade3ed244c