vdanen/rhvex-cve huggingface dataset:
CVE-2022-0175 (Moderate severity, published 2021-12-13)
CVSS score: 6.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N)
CWE: CWE-909
Description: A flaw was found in the VirGL virtual OpenGL renderer (virglrenderer). The virgl did not properly initialize memory when allocating a host-backed memory resource. A malicious guest could use this flaw to mmap from the guest kernel and read this uninitialized memory from the host, possibly leading to information disclosure.
Statement: This flaw does not affect Red Hat Enterprise Linux as `virglrenderer` is not shipped in RHEL. Support for VirGL was enabled as a Technology Preview in Red Hat Enterprise Linux Advanced Virtualization 8.2 and later disabled in Red Hat Enterprise Linux Advanced Virtualization 8.3. For more information on the Technology Preview support scope, please refer to https://access.redhat.com/support/offerings/techpreview.
Mitigation: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
CVE-2022-41678 (Moderate severity, published 2023-11-27)
CVSS score: 7.5 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
CWE: CWE-502
Description: Once an user is authenticated on Jolokia, he can potentially trigger arbitrary code execution. 

In details, in ActiveMQ configurations, jetty allows
org.jolokia.http.AgentServlet to handler request to /api/jolokia

org.jolokia.http.HttpRequestHandler#handlePostRequest is able to
create JmxRequest through JSONObject. And calls to
org.jolokia.http.HttpRequestHandler#executeRequest.

Into deeper calling stacks,
org.jolokia.handler.ExecHandler#doHandleRequest can be invoked
through refection. This could lead to RCE through via
various mbeans. One example is unrestricted deserialization in jdk.management.jfr.FlightRecorderMXBeanImpl which exists on Java version above 11.

1 Call newRecording.

2 Call setConfiguration. And a webshell data hides in it.

3 Call startRecording.

4 Call copyTo method. The webshell will be written to a .jsp file.

The mitigation is to restrict (by default) the actions authorized on Jolokia, or disable Jolokia.
A more restrictive Jolokia configuration has been defined in default ActiveMQ distribution. We encourage users to upgrade to ActiveMQ distributions version including updated Jolokia configuration: 5.16.6, 5.17.4, 5.18.0, 6.0.0.

Statement: This vulnerability is considered moderate severity due to the requirement of authenticated access to exploit the flaw, significantly reducing the risk to systems that enforce strong authentication controls. While it does allow for remote code execution through Jolokia's request handling and Java Management Extensions (JMX), the exploitation pathway is complex and relies on specific conditions, such as the presence of Java 11 or higher and misconfigured or permissive Jolokia settings. an authenticated attacker to achieve remote code execution (RCE) within the ActiveMQ environment.Only an authenticated attacker to achieve remote code execution (RCE) within the ActiveMQ environment. In environments where authentication is well-managed and Jolokia is correctly configured or disabled, the likelihood of successful exploitation is reduced, mitigating the overall impact on system security.
Mitigation: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
CVE-2022-49248 (Moderate severity, published 2025-02-25)
CVSS score: 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Description: In the Linux kernel, the following vulnerability has been resolved:

ALSA: firewire-lib: fix uninitialized flag for AV/C deferred transaction

AV/C deferred transaction was supported at a commit 00a7bb81c20f ("ALSA:
firewire-lib: Add support for deferred transaction") while 'deferrable'
flag can be uninitialized for non-control/notify AV/C transactions.
UBSAN reports it:

kernel: ================================================================================
kernel: UBSAN: invalid-load in /build/linux-aa0B4d/linux-5.15.0/sound/firewire/fcp.c:363:9
kernel: load of value 158 is not a valid value for type '_Bool'
kernel: CPU: 3 PID: 182227 Comm: irq/35-firewire Tainted: P           OE     5.15.0-18-generic #18-Ubuntu
kernel: Hardware name: Gigabyte Technology Co., Ltd. AX370-Gaming 5/AX370-Gaming 5, BIOS F42b 08/01/2019
kernel: Call Trace:
kernel:  <IRQ>
kernel:  show_stack+0x52/0x58
kernel:  dump_stack_lvl+0x4a/0x5f
kernel:  dump_stack+0x10/0x12
kernel:  ubsan_epilogue+0x9/0x45
kernel:  __ubsan_handle_load_invalid_value.cold+0x44/0x49
kernel:  fcp_response.part.0.cold+0x1a/0x2b [snd_firewire_lib]
kernel:  fcp_response+0x28/0x30 [snd_firewire_lib]
kernel:  fw_core_handle_request+0x230/0x3d0 [firewire_core]
kernel:  handle_ar_packet+0x1d9/0x200 [firewire_ohci]
kernel:  ? handle_ar_packet+0x1d9/0x200 [firewire_ohci]
kernel:  ? transmit_complete_callback+0x9f/0x120 [firewire_core]
kernel:  ar_context_tasklet+0xa8/0x2e0 [firewire_ohci]
kernel:  tasklet_action_common.constprop.0+0xea/0xf0
kernel:  tasklet_action+0x22/0x30
kernel:  __do_softirq+0xd9/0x2e3
kernel:  ? irq_finalize_oneshot.part.0+0xf0/0xf0
kernel:  do_softirq+0x75/0xa0
kernel:  </IRQ>
kernel:  <TASK>
kernel:  __local_bh_enable_ip+0x50/0x60
kernel:  irq_forced_thread_fn+0x7e/0x90
kernel:  irq_thread+0xba/0x190
kernel:  ? irq_thread_fn+0x60/0x60
kernel:  kthread+0x11e/0x140
kernel:  ? irq_thread_check_affinity+0xf0/0xf0
kernel:  ? set_kthread_struct+0x50/0x50
kernel:  ret_from_fork+0x22/0x30
kernel:  </TASK>
kernel: ================================================================================

This commit fixes the bug. The bug has no disadvantage for the non-
control/notify AV/C transactions since the flag has an effect for AV/C
response with INTERIM (0x0f) status which is not used for the transactions
in AV/C general specification.
CVE-2022-23814 (Moderate severity, published 2022-11-08)
CVSS score: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
CWE: CWE-307
Description: Failure to validate addresses provided by software to BIOS commands may result in a potential loss of integrity of guest memory in a confidential compute environment.

Mitigation: Please contact AMD for more updates on this flaw.
CVE-2022-49618 (Low severity, published 2025-02-25)
CVSS score: 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
CWE: CWE-476
Description: In the Linux kernel, the following vulnerability has been resolved:

pinctrl: aspeed: Fix potential NULL dereference in aspeed_pinmux_set_mux()

pdesc could be null but still dereference pdesc->name and it will lead to
a null pointer access. So we move a null check before dereference.
CVE-2022-1271 (Important severity, published 2022-04-06)
CVSS score: 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
CWE: CWE-1173
Description: An arbitrary file write vulnerability was found in GNU gzip's zgrep utility. When zgrep is applied on the attacker's chosen file name (for example, a crafted file name), this can overwrite an attacker's content to an arbitrary attacker-selected file. This flaw occurs due to insufficient validation when processing filenames with two or more newlines where selected content and the target file names are embedded in crafted multi-line file names. This flaw allows a remote, low privileged attacker to force zgrep to write arbitrary files on the system.
Statement: This bug was introduced in gzip-1.3.10 and is relatively hard to exploit.

Red Hat Enterprise Linux 6 was affected but Out of Support Cycle because gzip was not listed in Red Hat Enterprise Linux 6 ELS Inclusion List.
https://access.redhat.com/articles/4997301
Mitigation: Red Hat has investigated whether possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.
CVE-2022-24778 (Important severity, published 2022-03-24)
CVSS score: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
CWE: CWE-303
Description: A flaw was found in the imgcrypt library when checking the keys of an authorized user to access an encrypted image on systems where layers are not available and cannot run on the host architecture. This flaw allows an attacker to run an image without providing the previously decrypted keys.
Statement: Only Fedora is using the affected codebase. Hence, marking other products as of Low impact as they are using an affected version of 'imgcrypt' as a transitive dependency.
CVE-2022-1621 (Moderate severity, published 2022-05-09)
CVSS score: 7.3 (CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:H)
CWE: CWE-787
Description: A flaw was found in vim, where it is vulnerable to a heap buffer overflow in the vim_strncpy find_word function. This flaw allows a specially crafted file to crash software, modify memory and possibly perform remote execution when opened in vim.
CVE-2022-2580 (Low severity, published 2022-07-31)
CVSS score: 7.8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
CWE: CWE-122
Description: A flaw was found in vim. The vulnerability occurs due to illegal memory access and leads to a heap buffer overflow. This flaw allows an attacker to input a specially crafted file, leading to a crash or code execution.
Mitigation: Untrusted vim scripts with -s [scriptin] are not recommended to run.
CVE-2022-49395 (Moderate severity, published 2025-02-25)
CVSS score: 6 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H)
CWE: CWE-125
Description: A vulnerability was found in the Linux kernel's user mode (um) subsystem, specifically within the Local Descriptor Table (LDT) setup functionality. The issue arises from the syscall_stub_data() function misinterpreting the data_count parameter as a byte count rather than a count of longs, leading to an out-of-bounds read. This flaw could expose sensitive kernel memory and cause system instability.
CVE-2022-42920 (Important severity, published 2022-11-03)
CVSS score: 8.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
CWE: CWE-787
Description: An out-of-bounds (OOB) write flaw was found in Apache Commons BCEL API. This flaw can be used to produce arbitrary bytecode and may abuse applications that pass attacker-controlled data to those APIs, giving the attacker more control over the resulting bytecode than otherwise expected.
Statement: Fuse 7 ships the code in question but does not utilize it in the product, so it is affected at a reduced impact of Moderate.
CVE-2022-0417 (Moderate severity, published 2022-01-31)
CVSS score: 7.8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
CWE: CWE-787
Description: A flaw was found in vim. The vulnerability occurs due to illegal memory access and leads to a heap buffer overflow. This flaw allows an attacker to input a specially crafted file, leading to a crash or code execution.
Mitigation: Untrusted vim scripts with -s [scriptin] are not recommended to run.
CVE-2022-48838 (Moderate severity, published 2024-07-15)
CVSS score: 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Description: In the Linux kernel, the following vulnerability has been resolved:

usb: gadget: Fix use-after-free bug by not setting udc->dev.driver

The syzbot fuzzer found a use-after-free bug:

BUG: KASAN: use-after-free in dev_uevent+0x712/0x780 drivers/base/core.c:2320
Read of size 8 at addr ffff88802b934098 by task udevd/3689

CPU: 2 PID: 3689 Comm: udevd Not tainted 5.17.0-rc4-syzkaller-00229-g4f12b742eb2b #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0x8d/0x303 mm/kasan/report.c:255
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 dev_uevent+0x712/0x780 drivers/base/core.c:2320
 uevent_show+0x1b8/0x380 drivers/base/core.c:2391
 dev_attr_show+0x4b/0x90 drivers/base/core.c:2094

Although the bug manifested in the driver core, the real cause was a
race with the gadget core.  dev_uevent() does:

	if (dev->driver)
		add_uevent_var(env, "DRIVER=%s", dev->driver->name);

and between the test and the dereference of dev->driver, the gadget
core sets dev->driver to NULL.

The race wouldn't occur if the gadget core registered its devices on
a real bus, using the standard synchronization techniques of the
driver core.  However, it's not necessary to make such a large change
in order to fix this bug; all we need to do is make sure that
udc->dev.driver is always NULL.

In fact, there is no reason for udc->dev.driver ever to be set to
anything, let alone to the value it currently gets: the address of the
gadget's driver.  After all, a gadget driver only knows how to manage
a gadget, not how to manage a UDC.

This patch simply removes the statements in the gadget core that touch
udc->dev.driver.
CVE-2022-36227 (Low severity, published 2022-07-10)
CVSS score: 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
CWE: CWE-476
Description: A flaw was found in libarchive. A missing check of the return value of the calloc function can cause a NULL pointer dereference in an out-of-memory condition or when a memory allocation limit is reached, resulting in the program linked with libarchive to crash.
Statement: This vulnerability can only be exploited in an out-of-memory condition or when a memory allocation limit is reached. Additionally, the only known security impact of this issue is a denial of service. Due to these conditions, this flaw was rated as having a low severity.
The out-of-memory condition is triggered when all physical memory, including swap space, is being used. Furthermore, depending on the configuration, this event can cause the out-of-memory killer (OOM-Killer) to be activated, terminating the application and preventing the NULL pointer dereference from being exploited.
CVE-2022-48992 (Moderate severity, published 2024-10-20)
CVSS score: 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
CWE: CWE-476
Description: In the Linux kernel, the following vulnerability has been resolved:

ASoC: soc-pcm: Add NULL check in BE reparenting

Add NULL check in dpcm_be_reparent API, to handle
kernel NULL pointer dereference error.
The issue occurred in fuzzing test.
Statement: This issue is fixed in RHEL-9.2 and above (including 8.10):
~~~
in (rhel-9.2, rhel-9.3, rhel-9.4, rhel-9.5, rhel-9.6) ASoC: soc-pcm: Add NULL check in BE reparenting
in (rhel-8.8, rhel-8.9, rhel-8.10) ASoC: soc-pcm: Add NULL check in BE reparenting
~~~

Please note that while RHEL-9 kernel-rt still appears as affected, it has been fixed in the same RHSA as RHEL-9 kernel. This is because from RHEL-9.3 onwards, the kernel and kernel-rt fixes are bundled together in a single errata.
CVE-2022-49680 (Moderate severity, published 2025-02-25)
CVSS score: 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
CWE: CWE-402
Description: In the Linux kernel, the following vulnerability has been resolved:

ARM: exynos: Fix refcount leak in exynos_map_pmu

of_find_matching_node() returns a node pointer with refcount
incremented, we should use of_node_put() on it when not need anymore.
Add missing of_node_put() to avoid refcount leak.
of_node_put() checks null pointer.
CVE-2022-0552 (Moderate severity, published 2022-02-28)
CVSS score: 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N)
CWE: CWE-444
Description: A flaw was found in the original fix for the netty-codec-http CVE-2021-21409, where the OpenShift Logging openshift-logging/elasticsearch6-rhel8 container was incomplete. The vulnerable netty-codec-http maven package was not removed from the image content.
Statement: This CVE only applies to the OpenShift Logging openshift-logging/elasticsearch6-rhel8 container image, shipped in OpenShift Logging 5.1, 5.2. and 5.3.
https://access.redhat.com/errata/RHSA-2021:5128
https://access.redhat.com/errata/RHSA-2021:5127
https://access.redhat.com/errata/RHSA-2021:5129
CVE-2022-4842 (Moderate severity, published 2022-08-15)
CVSS score: 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
CWE: CWE-476
Description: A NULL pointer dereference flaw was found in the Linux kernel’s NTFS3 driver. This flaw allows a local user to crash the system.
CVE-2022-37436 (Moderate severity, published 2023-01-16)
CVSS score: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
CWE: CWE-113
Description: A flaw was found in the mod_proxy module of httpd. A malicious backend can cause the response headers to be truncated because they are not cleaned when an error is found while reading them, resulting in some headers being incorporated into the response body and not being interpreted by a client.
Statement: This flaw is only exploitable via bad headers generated by a malicious backend or a malicious application.

httpd as shipped in Red Hat Enterprise Linux 7, 8, 9 and in RHSCL is vulnerable to this flaw. httpd as shipped in Red Hat Enterprise Linux 6 is not affected.

This flaw has been rated as having a security impact of moderate, and is not currently planned to be addressed in future updates of Red Hat Enterprise Linux 7. Red Hat Enterprise Linux 7 is now in Maintenance Support 2 Phase of the support and maintenance life cycle. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata.
Mitigation: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. It's recommended to update the affected packages as soon as an update is available.
CVE-2022-29582 (Moderate severity, published 2022-04-08)
CVSS score: 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
CWE: CWE-366
Description: A use-after-free flaw was found in the Linux kernel’s io_uring interface subsystem in the way a user triggers a race condition between timeout flush and removal. This flaw allows a local user to crash or escalate their privileges on the system.
CVE-2022-1343 (Moderate severity, published 2022-05-02)
CVSS score: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
CWE: CWE-295
Description: A flaw was found in OpenSSL's Online Certificate Status Protocol (OCSP) response functionality in the signer certificate verification routines. This flaw could result in a linked application falsely believing that an x.509 Digital Certificate is either "good" or "unknown" when revoked and requires that the application use a non-default configuration. This vulnerability leads to an issue with data integrity and confidentiality.
Statement: This flaw impact has been rated Moderate because the configuration required for it to occur is non-default, not common, and there is still an indication of failure at the CLI for the OCSP application.
CVE-2022-4141 (Low severity, published 2022-11-24)
CVSS score: 7.8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
CWE: CWE-787
Description: A heap-based buffer overflow vulnerability was found in Vim due to invalid memory access. This issue could allow an attacker to trick a user into opening a specially crafted file, triggering an out-of-bounds write that causes an application to crash, possibly executing code and corrupting memory.
Statement: Red Hat Product Security has rated this issue as having a Low security impact, because the "victim" has to run an untrusted file in script mode.

For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/ and Red Hat Enterprise Linux Life Cycle & Updates Policy: https://access.redhat.com/support/policy/updates/errata/.
Mitigation: Untrusted vim scripts with -s [scriptin] are not recommended to run.
CVE-2022-2996 (Moderate severity, published 2022-05-31)
CVSS score: 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)
CWE: CWE-295
Description: A flaw was found in the python-scciclient when making an HTTPS connection to a server where the server's certificate would not be verified. This issue opens up the connection to possible Man-in-the-middle (MITM) attacks.
CVE-2022-29078 (Important severity, published 2022-04-24)
CVSS score: 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
CWE: CWE-77
Description: A Command injection attack was found in ejs (Embedded JavaScript templates) for Node.js, which allows an attacker to execute server-side template injection in settings[view options][outputFunctionName]. This is parsed as an internal option and overwrites the outputFunctionName option with an arbitrary OS command executed upon template compilation.
CVE-2022-49053 (Moderate severity, published 2025-02-25)
CVSS score: 6 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H)
CWE: CWE-416
Description: In the Linux kernel, the following vulnerability has been resolved:

scsi: target: tcmu: Fix possible page UAF

tcmu_try_get_data_page() looks up pages under cmdr_lock, but it does not
take refcount properly and just returns page pointer. When
tcmu_try_get_data_page() returns, the returned page may have been freed by
tcmu_blocks_release().

We need to get_page() under cmdr_lock to avoid concurrent
tcmu_blocks_release().
CVE-2022-49403 (Moderate severity, published 2025-02-25)
CVSS score: 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
CWE: CWE-401
Description: In the Linux kernel, the following vulnerability has been resolved:

lib/string_helpers: fix not adding strarray to device's resource list

Add allocated strarray to device's resource list. This is a must to
automatically release strarray when the device disappears.

Without this fix we have a memory leak in the few drivers which use
devm_kasprintf_strarray().
CVE-2022-48642 (Low severity, published 2024-04-27)
CVSS score: 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
CWE: CWE-400
Description: In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_tables: fix percpu memory leak at nf_tables_addchain()

It seems to me that percpu memory for chain stats started leaking since
commit 3bc158f8d0330f0a ("netfilter: nf_tables: map basechain priority to
hardware priority") when nft_chain_offload_priority() returned an error.
CVE-2022-49950 (Moderate severity, published 2025-06-17)
CVSS score: 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
Description: In the Linux kernel, the following vulnerability has been resolved:

misc: fastrpc: fix memory corruption on open

The probe session-duplication overflow check incremented the session
count also when there were no more available sessions so that memory
beyond the fixed-size slab-allocated session array could be corrupted in
fastrpc_session_alloc() on open().
CVE-2022-45420 (Low severity, published 2022-11-14)
CVSS score: 4.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N)
Description: The Mozilla Foundation Security Advisory describes this flaw as: Use tables inside of an iframe, an attacker could have caused iframe contents to be rendered outside the boundaries of the iframe, resulting in potential user confusion or spoofing attacks.
CVE-2022-48707 (Low severity, published 2024-05-20)
CVSS score: 4.4 (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H)
CWE: CWE-476
Description: In the Linux kernel, the following vulnerability has been resolved:

cxl/region: Fix null pointer dereference for resetting decoder

Not all decoders have a reset callback.

The CXL specification allows a host bridge with a single root port to
have no explicit HDM decoders. Currently the region driver assumes there
are none.  As such the CXL core creates a special pass through decoder
instance without a commit/reset callback.

Prior to this patch, the ->reset() callback was called unconditionally when
calling cxl_region_decode_reset. Thus a configuration with 1 Host Bridge,
1 Root Port, and one directly attached CXL type 3 device or multiple CXL
type 3 devices attached to downstream ports of a switch can cause a null
pointer dereference.

Before the fix, a kernel crash was observed when we destroy the region, and
a pass through decoder is reset.

The issue can be reproduced as below,
    1) create a region with a CXL setup which includes a HB with a
    single root port under which a memdev is attached directly.
    2) destroy the region with cxl destroy-region regionX -f.