linux-cve-announce - CVE-2022-49107: ceph: fix memory leak in ceph_readdir when note_last

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Message-ID: <2025022601-CVE-2022-49107-03bc@gregkh>
Date: Wed, 26 Feb 2025 02:55:12 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49107: ceph: fix memory leak in ceph_readdir when note_last_dentry returns error

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

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

ceph: fix memory leak in ceph_readdir when note_last_dentry returns error

Reset the last_readdir at the same time, and add a comment explaining
why we don't free last_readdir when dir_emit returns false.

The Linux kernel CVE team has assigned CVE-2022-49107 to this issue.


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

	Fixed in 5.10.111 with commit f4429786129648a8f4bb1e5faa143c4478cc5c4a
	Fixed in 5.15.34 with commit 2fe82d3254029ef9ec4e7be890125d5ef4f537de
	Fixed in 5.16.20 with commit e792575b902a3939ca482491ee9fb3a236f99640
	Fixed in 5.17.3 with commit 7f740ede35132d3d5d19747cad56a511d21bb156
	Fixed in 5.18 with commit f639d9867eea647005dc824e0e24f39ffc50d4e4

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-2022-49107
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:
	fs/ceph/dir.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/f4429786129648a8f4bb1e5faa143c4478cc5c4a
	https://git.kernel.org/stable/c/2fe82d3254029ef9ec4e7be890125d5ef4f537de
	https://git.kernel.org/stable/c/e792575b902a3939ca482491ee9fb3a236f99640
	https://git.kernel.org/stable/c/7f740ede35132d3d5d19747cad56a511d21bb156
	https://git.kernel.org/stable/c/f639d9867eea647005dc824e0e24f39ffc50d4e4