linux-cve-announce - CVE-2024-50174: drm/panthor: Fix race when converting group handle to group object

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Message-ID: <2024110806-CVE-2024-50174-a1aa@gregkh>
Date: Fri,  8 Nov 2024 06:24:05 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50174: drm/panthor: Fix race when converting group handle to group object

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

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

drm/panthor: Fix race when converting group handle to group object

XArray provides it's own internal lock which protects the internal array
when entries are being simultaneously added and removed. However there
is still a race between retrieving the pointer from the XArray and
incrementing the reference count.

To avoid this race simply hold the internal XArray lock when
incrementing the reference count, this ensures there cannot be a racing
call to xa_erase().

The Linux kernel CVE team has assigned CVE-2024-50174 to this issue.


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

	Issue introduced in 6.10 with commit de8548813824 and fixed in 6.10.14 with commit 8a585d553c11
	Issue introduced in 6.10 with commit de8548813824 and fixed in 6.11.3 with commit 44742138d151
	Issue introduced in 6.10 with commit de8548813824 and fixed in 6.12-rc2 with commit cac075706f29

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-2024-50174
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/panthor/panthor_sched.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/8a585d553c11965332d7a2d74e79ef92a42bfc87
	https://git.kernel.org/stable/c/44742138d151c3a945460ae7beff8ae45ac0bf58
	https://git.kernel.org/stable/c/cac075706f298948898b1f63e81709df42afa75d