linux-cve-announce - CVE-2022-50146: PCI: dwc: Deallocate EPC memory on dw_pcie_ep

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Message-ID: <2025061820-CVE-2022-50146-d641@gregkh>
Date: Wed, 18 Jun 2025 13:03:31 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50146: PCI: dwc: Deallocate EPC memory on dw_pcie_ep_init() errors

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

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

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

PCI: dwc: Deallocate EPC memory on dw_pcie_ep_init() errors

If dw_pcie_ep_init() fails to perform any action after the EPC memory is
initialized and the MSI memory region is allocated, the latter parts won't
be undone thus causing a memory leak.  Add a cleanup-on-error path to fix
these leaks.

[bhelgaas: commit log]

The Linux kernel CVE team has assigned CVE-2022-50146 to this issue.


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

	Issue introduced in 4.16 with commit 2fd0c9d966cc11bb5f73556dd788d12f501d8755 and fixed in 5.10.137 with commit e7599a5974d4c64eaae8009c3f2e47b9e3223e07
	Issue introduced in 4.16 with commit 2fd0c9d966cc11bb5f73556dd788d12f501d8755 and fixed in 5.15.61 with commit b03a8f1264ea8c363bec9ef6e37b467f27cb04ea
	Issue introduced in 4.16 with commit 2fd0c9d966cc11bb5f73556dd788d12f501d8755 and fixed in 5.18.18 with commit 2d546db5c80c45cac3ccd929550244fd58f4ff58
	Issue introduced in 4.16 with commit 2fd0c9d966cc11bb5f73556dd788d12f501d8755 and fixed in 5.19.2 with commit 3b453f5d06d1f1d6b20a75ea51dc7b53ae78f479
	Issue introduced in 4.16 with commit 2fd0c9d966cc11bb5f73556dd788d12f501d8755 and fixed in 6.0 with commit 8161e9626b50892eaedbd8070ecb1586ecedb109

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-2022-50146
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/pci/controller/dwc/pcie-designware-ep.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/e7599a5974d4c64eaae8009c3f2e47b9e3223e07
	https://git.kernel.org/stable/c/b03a8f1264ea8c363bec9ef6e37b467f27cb04ea
	https://git.kernel.org/stable/c/2d546db5c80c45cac3ccd929550244fd58f4ff58
	https://git.kernel.org/stable/c/3b453f5d06d1f1d6b20a75ea51dc7b53ae78f479
	https://git.kernel.org/stable/c/8161e9626b50892eaedbd8070ecb1586ecedb109