linux-cve-announce - CVE-2024-56742: vfio/mlx5: Fix an unwind issue in mlx5vf_add_migration

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Message-ID: <2024122925-CVE-2024-56742-b3d2@gregkh>
Date: Sun, 29 Dec 2024 12:29:35 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-56742: vfio/mlx5: Fix an unwind issue in mlx5vf_add_migration_pages()

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

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

vfio/mlx5: Fix an unwind issue in mlx5vf_add_migration_pages()

Fix an unwind issue in mlx5vf_add_migration_pages().

If a set of pages is allocated but fails to be added to the SG table,
they need to be freed to prevent a memory leak.

Any pages successfully added to the SG table will be freed as part of
mlx5vf_free_data_buffer().

The Linux kernel CVE team has assigned CVE-2024-56742 to this issue.


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

	Issue introduced in 5.18 with commit 6fadb021266d03c5fd7bca2cfa1607efd246dad1 and fixed in 6.11.11 with commit 769fe4ce444b646b0bf6ac308de80686c730c7df
	Issue introduced in 5.18 with commit 6fadb021266d03c5fd7bca2cfa1607efd246dad1 and fixed in 6.12.2 with commit c44f1b2ddfa81c8d7f8e9b6bc76c427bc00e69d5
	Issue introduced in 5.18 with commit 6fadb021266d03c5fd7bca2cfa1607efd246dad1 and fixed in 6.13-rc1 with commit 22e87bf3f77c18f5982c19ffe2732ef0c7a25f16

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-2024-56742
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/vfio/pci/mlx5/cmd.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/769fe4ce444b646b0bf6ac308de80686c730c7df
	https://git.kernel.org/stable/c/c44f1b2ddfa81c8d7f8e9b6bc76c427bc00e69d5
	https://git.kernel.org/stable/c/22e87bf3f77c18f5982c19ffe2732ef0c7a25f16