linux-cve-announce - CVE-2022-49422: dmaengine: idxd: Fix the error handling path in idxd_cdev

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Message-ID: <2025022654-CVE-2022-49422-b047@gregkh>
Date: Wed, 26 Feb 2025 03:11:36 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49422: dmaengine: idxd: Fix the error handling path in idxd_cdev_register()

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

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

dmaengine: idxd: Fix the error handling path in idxd_cdev_register()

If a call to alloc_chrdev_region() fails, the already allocated resources
are leaking.

Add the needed error handling path to fix the leak.

The Linux kernel CVE team has assigned CVE-2022-49422 to this issue.


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

	Issue introduced in 5.6 with commit 42d279f9137ab7d5503836baec2739284b278d8f and fixed in 5.10.121 with commit 6073af78156b8c3fc1198f8bcc190b7ac3ac0143
	Issue introduced in 5.6 with commit 42d279f9137ab7d5503836baec2739284b278d8f and fixed in 5.15.46 with commit b3c7b5d08e9d5b2ff31c03078c00ecf11042419f
	Issue introduced in 5.6 with commit 42d279f9137ab7d5503836baec2739284b278d8f and fixed in 5.17.14 with commit 5e88561eceb34ae3f88451c2b8e30fe403484189
	Issue introduced in 5.6 with commit 42d279f9137ab7d5503836baec2739284b278d8f and fixed in 5.18.3 with commit c308a2e711a52a47f4b45e7add2b5200169e429a
	Issue introduced in 5.6 with commit 42d279f9137ab7d5503836baec2739284b278d8f and fixed in 5.19 with commit aab08c1aac01097815fbcf10fce7021d2396a31f

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-2022-49422
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/dma/idxd/cdev.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/6073af78156b8c3fc1198f8bcc190b7ac3ac0143
	https://git.kernel.org/stable/c/b3c7b5d08e9d5b2ff31c03078c00ecf11042419f
	https://git.kernel.org/stable/c/5e88561eceb34ae3f88451c2b8e30fe403484189
	https://git.kernel.org/stable/c/c308a2e711a52a47f4b45e7add2b5200169e429a
	https://git.kernel.org/stable/c/aab08c1aac01097815fbcf10fce7021d2396a31f