linux-cve-announce - CVE-2022-49730: scsi: lpfc: Resolve NULL ptr dereference after an ELS LOGO is aborted

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Message-ID: <2025022634-CVE-2022-49730-db2b@gregkh>
Date: Wed, 26 Feb 2025 03:24:53 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49730: scsi: lpfc: Resolve NULL ptr dereference after an ELS LOGO is aborted

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

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

scsi: lpfc: Resolve NULL ptr dereference after an ELS LOGO is aborted

A use-after-free crash can occur after an ELS LOGO is aborted.

Specifically, a nodelist structure is freed and then
ndlp->vport->cfg_log_verbose is dereferenced in lpfc_nlp_get() when the
discovery state machine is mistakenly called a second time with
NLP_EVT_DEVICE_RM argument.

Rework lpfc_cmpl_els_logo() to prevent the duplicate calls to release a
nodelist structure.

The Linux kernel CVE team has assigned CVE-2022-49730 to this issue.


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

	Fixed in 5.15.49 with commit 5e83869e29448958f8ae2c6911f350318f75e4fc
	Fixed in 5.18.6 with commit eea34ce23dc3a595695856dc73bb132a9c5a2902
	Fixed in 5.19 with commit b1b3440f437b75fb2a9b0cfe58df461e40eca474

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-2022-49730
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/scsi/lpfc/lpfc_els.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/5e83869e29448958f8ae2c6911f350318f75e4fc
	https://git.kernel.org/stable/c/eea34ce23dc3a595695856dc73bb132a9c5a2902
	https://git.kernel.org/stable/c/b1b3440f437b75fb2a9b0cfe58df461e40eca474