linux-cve-announce - CVE-2022-49542: scsi: lpfc: Move cfg_log_verbose check before calling lpfc_dmp

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Message-ID: <2025022614-CVE-2022-49542-8f78@gregkh>
Date: Wed, 26 Feb 2025 03:13:36 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49542: scsi: lpfc: Move cfg_log_verbose check before calling lpfc_dmp_dbg()

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

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

scsi: lpfc: Move cfg_log_verbose check before calling lpfc_dmp_dbg()

In an attempt to log message 0126 with LOG_TRACE_EVENT, the following hard
lockup call trace hangs the system.

Call Trace:
 _raw_spin_lock_irqsave+0x32/0x40
 lpfc_dmp_dbg.part.32+0x28/0x220 [lpfc]
 lpfc_cmpl_els_fdisc+0x145/0x460 [lpfc]
 lpfc_sli_cancel_jobs+0x92/0xd0 [lpfc]
 lpfc_els_flush_cmd+0x43c/0x670 [lpfc]
 lpfc_els_flush_all_cmd+0x37/0x60 [lpfc]
 lpfc_sli4_async_event_proc+0x956/0x1720 [lpfc]
 lpfc_do_work+0x1485/0x1d70 [lpfc]
 kthread+0x112/0x130
 ret_from_fork+0x1f/0x40
Kernel panic - not syncing: Hard LOCKUP

The same CPU tries to claim the phba->port_list_lock twice.

Move the cfg_log_verbose checks as part of the lpfc_printf_vlog() and
lpfc_printf_log() macros before calling lpfc_dmp_dbg().  There is no need
to take the phba->port_list_lock within lpfc_dmp_dbg().

The Linux kernel CVE team has assigned CVE-2022-49542 to this issue.


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

	Fixed in 5.15.46 with commit 271725e4028559ae7974d762a8467dc9de412f2e
	Fixed in 5.17.14 with commit cc6501afccec55b8b6c90584cbf71f1fefa77d1e
	Fixed in 5.18.3 with commit 09c772557a4fd9490fed1bfb133268313ea22213
	Fixed in 5.19 with commit e294647b1aed4247fe52851f3a3b2b19ae906228

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-2022-49542
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_init.c
	drivers/scsi/lpfc/lpfc_logmsg.h


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/271725e4028559ae7974d762a8467dc9de412f2e
	https://git.kernel.org/stable/c/cc6501afccec55b8b6c90584cbf71f1fefa77d1e
	https://git.kernel.org/stable/c/09c772557a4fd9490fed1bfb133268313ea22213
	https://git.kernel.org/stable/c/e294647b1aed4247fe52851f3a3b2b19ae906228