linux-cve-announce - CVE-2022-49839: scsi: scsi_transport_sas: Fix error handling in sas_phy

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Message-ID: <2025050139-CVE-2022-49839-37b0@gregkh>
Date: Thu,  1 May 2025 16:10:29 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49839: scsi: scsi_transport_sas: Fix error handling in sas_phy_add()

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

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

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

scsi: scsi_transport_sas: Fix error handling in sas_phy_add()

If transport_add_device() fails in sas_phy_add(), the kernel will crash
trying to delete the device in transport_remove_device() called from
sas_remove_host().

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000108
CPU: 61 PID: 42829 Comm: rmmod Kdump: loaded Tainted: G        W          6.1.0-rc1+ #173
pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : device_del+0x54/0x3d0
lr : device_del+0x37c/0x3d0
Call trace:
 device_del+0x54/0x3d0
 attribute_container_class_device_del+0x28/0x38
 transport_remove_classdev+0x6c/0x80
 attribute_container_device_trigger+0x108/0x110
 transport_remove_device+0x28/0x38
 sas_phy_delete+0x30/0x60 [scsi_transport_sas]
 do_sas_phy_delete+0x6c/0x80 [scsi_transport_sas]
 device_for_each_child+0x68/0xb0
 sas_remove_children+0x40/0x50 [scsi_transport_sas]
 sas_remove_host+0x20/0x38 [scsi_transport_sas]
 hisi_sas_remove+0x40/0x68 [hisi_sas_main]
 hisi_sas_v2_remove+0x20/0x30 [hisi_sas_v2_hw]
 platform_remove+0x2c/0x60

Fix this by checking and handling return value of transport_add_device()
in sas_phy_add().

The Linux kernel CVE team has assigned CVE-2022-49839 to this issue.


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

	Issue introduced in 2.6.14 with commit c7ebbbce366c02e5657ac6b6059933fe0353b175 and fixed in 5.10.157 with commit 03aabcb88aeeb7221ddb6196ae84ad5fb17b743f
	Issue introduced in 2.6.14 with commit c7ebbbce366c02e5657ac6b6059933fe0353b175 and fixed in 5.15.80 with commit 2f21d653c648735657e23948b1d7ac7273de0f87
	Issue introduced in 2.6.14 with commit c7ebbbce366c02e5657ac6b6059933fe0353b175 and fixed in 6.0.10 with commit c736876ee294bb4f271d76a25cc7d70c8537bc5d
	Issue introduced in 2.6.14 with commit c7ebbbce366c02e5657ac6b6059933fe0353b175 and fixed in 6.1 with commit 5d7bebf2dfb0dc97aac1fbace0910e557ecdb16f

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-2022-49839
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/scsi_transport_sas.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/03aabcb88aeeb7221ddb6196ae84ad5fb17b743f
	https://git.kernel.org/stable/c/2f21d653c648735657e23948b1d7ac7273de0f87
	https://git.kernel.org/stable/c/c736876ee294bb4f271d76a25cc7d70c8537bc5d
	https://git.kernel.org/stable/c/5d7bebf2dfb0dc97aac1fbace0910e557ecdb16f