linux-cve-announce - CVE-2022-49644: drm/i915: fix a possible refcount leak in intel_dp_add_mst

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Message-ID: <2025022619-CVE-2022-49644-e3b0@gregkh>
Date: Wed, 26 Feb 2025 03:23:27 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49644: drm/i915: fix a possible refcount leak in intel_dp_add_mst_connector()

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

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

drm/i915: fix a possible refcount leak in intel_dp_add_mst_connector()

If drm_connector_init fails, intel_connector_free will be called to take
care of proper free. So it is necessary to drop the refcount of port
before intel_connector_free.

(cherry picked from commit cea9ed611e85d36a05db52b6457bf584b7d969e2)

The Linux kernel CVE team has assigned CVE-2022-49644 to this issue.


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

	Issue introduced in 4.15 with commit 091a4f91942a4396c67e5747f5cb38c6396d1fc5 and fixed in 5.4.207 with commit 72f231b9a88abcfac9f5ddaa1a0aacb3f9f87ba5
	Issue introduced in 4.15 with commit 091a4f91942a4396c67e5747f5cb38c6396d1fc5 and fixed in 5.10.132 with commit 592f3bad00b7e2a95a6fb7a4f9e742c061c9c3c1
	Issue introduced in 4.15 with commit 091a4f91942a4396c67e5747f5cb38c6396d1fc5 and fixed in 5.15.56 with commit 505114dda5bbfd07f4ce9a2df5b7d8ef5f2a1218
	Issue introduced in 4.15 with commit 091a4f91942a4396c67e5747f5cb38c6396d1fc5 and fixed in 5.18.13 with commit a91522b4279bebb098106a19b91f82b9c3213be9
	Issue introduced in 4.15 with commit 091a4f91942a4396c67e5747f5cb38c6396d1fc5 and fixed in 5.19 with commit 85144df9ff4652816448369de76897c57cbb1b93

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-2022-49644
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/gpu/drm/i915/display/intel_dp_mst.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/72f231b9a88abcfac9f5ddaa1a0aacb3f9f87ba5
	https://git.kernel.org/stable/c/592f3bad00b7e2a95a6fb7a4f9e742c061c9c3c1
	https://git.kernel.org/stable/c/505114dda5bbfd07f4ce9a2df5b7d8ef5f2a1218
	https://git.kernel.org/stable/c/a91522b4279bebb098106a19b91f82b9c3213be9
	https://git.kernel.org/stable/c/85144df9ff4652816448369de76897c57cbb1b93