CVE-2022-49099: Drivers: hv: vmbus: Fix initialization of device object in vmbus_device_register()

CVE-2022-49099: Drivers: hv: vmbus: Fix initialization of device object in vmbus_device_register()

[Greg Kroah-Hartman]

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

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

Drivers: hv: vmbus: Fix initialization of device object in vmbus_device_register()

Initialize the device's dma_{mask,parms} pointers and the device's
dma_mask value before invoking device_register().  Address the
following trace with 5.17-rc7:

[   49.646839] WARNING: CPU: 0 PID: 189 at include/linux/dma-mapping.h:543
	netvsc_probe+0x37a/0x3a0 [hv_netvsc]
[   49.646928] Call Trace:
[   49.646930]  <TASK>
[   49.646935]  vmbus_probe+0x40/0x60 [hv_vmbus]
[   49.646942]  really_probe+0x1ce/0x3b0
[   49.646948]  __driver_probe_device+0x109/0x180
[   49.646952]  driver_probe_device+0x23/0xa0
[   49.646955]  __device_attach_driver+0x76/0xe0
[   49.646958]  ? driver_allows_async_probing+0x50/0x50
[   49.646961]  bus_for_each_drv+0x84/0xd0
[   49.646964]  __device_attach+0xed/0x170
[   49.646967]  device_initial_probe+0x13/0x20
[   49.646970]  bus_probe_device+0x8f/0xa0
[   49.646973]  device_add+0x41a/0x8e0
[   49.646975]  ? hrtimer_init+0x28/0x80
[   49.646981]  device_register+0x1b/0x20
[   49.646983]  vmbus_device_register+0x5e/0xf0 [hv_vmbus]
[   49.646991]  vmbus_add_channel_work+0x12d/0x190 [hv_vmbus]
[   49.646999]  process_one_work+0x21d/0x3f0
[   49.647002]  worker_thread+0x4a/0x3b0
[   49.647005]  ? process_one_work+0x3f0/0x3f0
[   49.647007]  kthread+0xff/0x130
[   49.647011]  ? kthread_complete_and_exit+0x20/0x20
[   49.647015]  ret_from_fork+0x22/0x30
[   49.647020]  </TASK>
[   49.647021] ---[ end trace 0000000000000000 ]---

The Linux kernel CVE team has assigned CVE-2022-49099 to this issue.


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

	Issue introduced in 5.17 with commit 743b237c3a7b0f5b44aa704aae8a1058877b6322 and fixed in 5.17.3 with commit 2fe4b8631427618175a32f125062df91a5fe3f73
	Issue introduced in 5.17 with commit 743b237c3a7b0f5b44aa704aae8a1058877b6322 and fixed in 5.18 with commit 3a5469582c241abca22500f36a9cb8e9331969cf

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-2022-49099
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/hv/vmbus_drv.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/2fe4b8631427618175a32f125062df91a5fe3f73
	https://git.kernel.org/stable/c/3a5469582c241abca22500f36a9cb8e9331969cf