linux-cve-announce - CVE-2025-22017: devlink: fix xa_alloc

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Message-ID: <2025040844-CVE-2025-22017-a66e@gregkh>
Date: Tue,  8 Apr 2025 10:16:51 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-22017: devlink: fix xa_alloc_cyclic() error handling

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

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

devlink: fix xa_alloc_cyclic() error handling

In case of returning 1 from xa_alloc_cyclic() (wrapping) ERR_PTR(1) will
be returned, which will cause IS_ERR() to be false. Which can lead to
dereference not allocated pointer (rel).

Fix it by checking if err is lower than zero.

This wasn't found in real usecase, only noticed. Credit to Pierre.

The Linux kernel CVE team has assigned CVE-2025-22017 to this issue.


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

	Issue introduced in 6.7 with commit c137743bce02b18c1537d4681aa515f7b80bf0a8 and fixed in 6.12.21 with commit f8aaa38cfaf6f20afa4db36b6529032fb69165dc
	Issue introduced in 6.7 with commit c137743bce02b18c1537d4681aa515f7b80bf0a8 and fixed in 6.13.9 with commit 466132f6d28a7e47a82501fe1c46b8f90487412e
	Issue introduced in 6.7 with commit c137743bce02b18c1537d4681aa515f7b80bf0a8 and fixed in 6.14 with commit f3b97b7d4bf316c3991e5634c9f4847c2df35478

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-2025-22017
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:
	net/devlink/core.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/f8aaa38cfaf6f20afa4db36b6529032fb69165dc
	https://git.kernel.org/stable/c/466132f6d28a7e47a82501fe1c46b8f90487412e
	https://git.kernel.org/stable/c/f3b97b7d4bf316c3991e5634c9f4847c2df35478