linux-cve-announce - CVE-2022-49162: video: fbdev: sm712fb: Fix crash in smtcfb

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Message-ID: <2025022611-CVE-2022-49162-654f@gregkh>
Date: Wed, 26 Feb 2025 02:56:07 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49162: video: fbdev: sm712fb: Fix crash in smtcfb_write()

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

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

video: fbdev: sm712fb: Fix crash in smtcfb_write()

When the sm712fb driver writes three bytes to the framebuffer, the
driver will crash:

    BUG: unable to handle page fault for address: ffffc90001ffffff
    RIP: 0010:smtcfb_write+0x454/0x5b0
    Call Trace:
     vfs_write+0x291/0xd60
     ? do_sys_openat2+0x27d/0x350
     ? __fget_light+0x54/0x340
     ksys_write+0xce/0x190
     do_syscall_64+0x43/0x90
     entry_SYSCALL_64_after_hwframe+0x44/0xae

Fix it by removing the open-coded endianness fixup-code.

The Linux kernel CVE team has assigned CVE-2022-49162 to this issue.


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

	Fixed in 4.9.311 with commit fb791514acf9070225eed46e1ccbb0aa7aae5da5
	Fixed in 4.14.276 with commit 0ec746674296c94137f074309c26d17e644c0498
	Fixed in 4.19.238 with commit 1aea36a62f0a0ad67eccc945bac0bd6422ef720f
	Fixed in 5.4.189 with commit 3b36c05f68ba32d0dfb63abc9016d6fe9117829f
	Fixed in 5.10.110 with commit b1c28577529cdfad40c8242673285f1e1e4c314e
	Fixed in 5.15.33 with commit eae90015d10f0c9a47fc4adccba4cd79dce664e4
	Fixed in 5.16.19 with commit aeb635b49530b7d19e140949753409f759ba99be
	Fixed in 5.17.2 with commit 809b8cde86320698661eec677222bc5c5df76176
	Fixed in 5.18 with commit 4f01d09b2bbfbcb47b3eb305560a7f4857a32260

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-2022-49162
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/video/fbdev/sm712fb.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/fb791514acf9070225eed46e1ccbb0aa7aae5da5
	https://git.kernel.org/stable/c/0ec746674296c94137f074309c26d17e644c0498
	https://git.kernel.org/stable/c/1aea36a62f0a0ad67eccc945bac0bd6422ef720f
	https://git.kernel.org/stable/c/3b36c05f68ba32d0dfb63abc9016d6fe9117829f
	https://git.kernel.org/stable/c/b1c28577529cdfad40c8242673285f1e1e4c314e
	https://git.kernel.org/stable/c/eae90015d10f0c9a47fc4adccba4cd79dce664e4
	https://git.kernel.org/stable/c/aeb635b49530b7d19e140949753409f759ba99be
	https://git.kernel.org/stable/c/809b8cde86320698661eec677222bc5c5df76176
	https://git.kernel.org/stable/c/4f01d09b2bbfbcb47b3eb305560a7f4857a32260