linux-cve-announce - CVE-2022-49824: ata: libata-transport: fix error handling in ata_tlink

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Message-ID: <2025050134-CVE-2022-49824-83df@gregkh>
Date: Thu,  1 May 2025 16:10:14 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49824: ata: libata-transport: fix error handling in ata_tlink_add()

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

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

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

ata: libata-transport: fix error handling in ata_tlink_add()

In ata_tlink_add(), the return value of transport_add_device() is
not checked. As a result, it causes null-ptr-deref while removing
the module, because transport_remove_device() is called to remove
the device that was not added.

Unable to handle kernel NULL pointer dereference at virtual address 00000000000000d0
CPU: 33 PID: 13850 Comm: rmmod Kdump: loaded Tainted: G        W          6.1.0-rc3+ #12
pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : device_del+0x48/0x39c
lr : device_del+0x44/0x39c
Call trace:
 device_del+0x48/0x39c
 attribute_container_class_device_del+0x28/0x40
 transport_remove_classdev+0x60/0x7c
 attribute_container_device_trigger+0x118/0x120
 transport_remove_device+0x20/0x30
 ata_tlink_delete+0x88/0xb0 [libata]
 ata_tport_delete+0x2c/0x60 [libata]
 ata_port_detach+0x148/0x1b0 [libata]
 ata_pci_remove_one+0x50/0x80 [libata]
 ahci_remove_one+0x4c/0x8c [ahci]

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

The Linux kernel CVE team has assigned CVE-2022-49824 to this issue.


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

	Issue introduced in 2.6.37 with commit d9027470b88631d0956ac37cdadfdeb9cdcf2c99 and fixed in 5.10.156 with commit 7377a14598f6b04446c54bc4a50cd249470d6c6f
	Issue introduced in 2.6.37 with commit d9027470b88631d0956ac37cdadfdeb9cdcf2c99 and fixed in 5.15.80 with commit 67b219314628b90b3a314528e177335b0cd5c70b
	Issue introduced in 2.6.37 with commit d9027470b88631d0956ac37cdadfdeb9cdcf2c99 and fixed in 6.0.10 with commit d5234480ca822bdcf03fe4d6a590ddcb854558f7
	Issue introduced in 2.6.37 with commit d9027470b88631d0956ac37cdadfdeb9cdcf2c99 and fixed in 6.1 with commit cf0816f6322c5c37ee52655f928e91ecf32da103

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-2022-49824
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/ata/libata-transport.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/7377a14598f6b04446c54bc4a50cd249470d6c6f
	https://git.kernel.org/stable/c/67b219314628b90b3a314528e177335b0cd5c70b
	https://git.kernel.org/stable/c/d5234480ca822bdcf03fe4d6a590ddcb854558f7
	https://git.kernel.org/stable/c/cf0816f6322c5c37ee52655f928e91ecf32da103