linux-cve-announce - CVE-2023-53244: media: pci: tw68: Fix null-ptr-deref bug in buf prepare and finish

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Message-ID: <2025091501-CVE-2023-53244-197d@gregkh>
Date: Mon, 15 Sep 2025 16:46:19 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53244: media: pci: tw68: Fix null-ptr-deref bug in buf prepare and finish

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

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

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

media: pci: tw68: Fix null-ptr-deref bug in buf prepare and finish

When the driver calls tw68_risc_buffer() to prepare the buffer, the
function call dma_alloc_coherent may fail, resulting in a empty buffer
buf->cpu. Later when we free the buffer or access the buffer, null ptr
deref is triggered.

This bug is similar to the following one:
https://git.linuxtv.org/media_stage.git/commit/?id=2b064d91440b33fba5b452f2d1b31f13ae911d71.

We believe the bug can be also dynamically triggered from user side.
Similarly, we fix this by checking the return value of tw68_risc_buffer()
and the value of buf->cpu before buffer free.

The Linux kernel CVE team has assigned CVE-2023-53244 to this issue.


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

	Fixed in 5.15.113 with commit dcf632bca424e6ff8c8eb89c96694e7f05cd29b6
	Fixed in 6.1.30 with commit 3c67f49a6643d973e83968ea35806c7b5ae68b56
	Fixed in 6.3.4 with commit 3715c5e9a8f96b6ed0dcbea06da443efccac1ecc
	Fixed in 6.4 with commit 1634b7adcc5bef645b3666fdd564e5952a9e24e0

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-2023-53244
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/media/pci/tw68/tw68-video.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/dcf632bca424e6ff8c8eb89c96694e7f05cd29b6
	https://git.kernel.org/stable/c/3c67f49a6643d973e83968ea35806c7b5ae68b56
	https://git.kernel.org/stable/c/3715c5e9a8f96b6ed0dcbea06da443efccac1ecc
	https://git.kernel.org/stable/c/1634b7adcc5bef645b3666fdd564e5952a9e24e0