linux-cve-announce - CVE-2022-50622: ext4: fix potential memory leak in ext4_fc_record_modified

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Message-ID: <2025120852-CVE-2022-50622-9f34@gregkh>
Date: Mon,  8 Dec 2025 10:16:59 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50622: ext4: fix potential memory leak in ext4_fc_record_modified_inode()

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

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

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

ext4: fix potential memory leak in ext4_fc_record_modified_inode()

As krealloc may return NULL, in this case 'state->fc_modified_inodes'
may not be freed by krealloc, but 'state->fc_modified_inodes' already
set NULL. Then will lead to 'state->fc_modified_inodes' memory leak.

The Linux kernel CVE team has assigned CVE-2022-50622 to this issue.


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

	Fixed in 5.10.150 with commit c9ce7766dc4e88e624c62a68221a3bbe8f06e856
	Fixed in 5.15.75 with commit 9b5eb368a86f97eb9831f5b53b8e43ec69bc7cd4
	Fixed in 5.19.17 with commit c0be17635f039f864b1108efec0015c73736e414
	Fixed in 6.0.3 with commit 24d39affc6be1acf6df86a8c3e2413b8a73749c7
	Fixed in 6.1 with commit 9305721a309fa1bd7c194e0d4a2335bf3b29dca4

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-2022-50622
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/ext4/fast_commit.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/c9ce7766dc4e88e624c62a68221a3bbe8f06e856
	https://git.kernel.org/stable/c/9b5eb368a86f97eb9831f5b53b8e43ec69bc7cd4
	https://git.kernel.org/stable/c/c0be17635f039f864b1108efec0015c73736e414
	https://git.kernel.org/stable/c/24d39affc6be1acf6df86a8c3e2413b8a73749c7
	https://git.kernel.org/stable/c/9305721a309fa1bd7c194e0d4a2335bf3b29dca4