linux-cve-announce - CVE-2023-53146: media: dw2102: Fix null-ptr-deref in dw2102_i2c

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Message-ID: <2025051417-CVE-2023-53146-db0e@gregkh>
Date: Wed, 14 May 2025 14:42:18 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53146: media: dw2102: Fix null-ptr-deref in dw2102_i2c_transfer()

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

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

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

media: dw2102: Fix null-ptr-deref in dw2102_i2c_transfer()

In dw2102_i2c_transfer, msg is controlled by user. When msg[i].buf
is null and msg[i].len is zero, former checks on msg[i].buf would be
passed. Malicious data finally reach dw2102_i2c_transfer. If accessing
msg[i].buf[0] without sanity check, null ptr deref would happen.
We add check on msg[i].len to prevent crash.

Similar commit:
commit 950e252cb469
("[media] dw2102: limit messages to buffer size")

The Linux kernel CVE team has assigned CVE-2023-53146 to this issue.


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

	Fixed in 4.14.326 with commit 77cbd42d29de9ffc93d5529bab8813cde53af14c
	Fixed in 4.19.295 with commit ecbe6d011b95c7da59f014f8d26cb7245ed1e11e
	Fixed in 5.4.257 with commit beb9550494e7349f92b9eaa283256a5ad9b1c9be
	Fixed in 5.10.197 with commit 97fdbdb750342cbc204befde976872fedb406ee6
	Fixed in 5.15.133 with commit 903566208ae6bb9c0e7e54355ce75bf6cf72485d
	Fixed in 6.1.55 with commit 08dfcbd03b2b7f918c4f87c6ff637054e510df74
	Fixed in 6.5.5 with commit fb28afab113a82b89ffec48c8155ec05b4f8cb5e
	Fixed in 6.6 with commit 5ae544d94abc8ff77b1b9bf8774def3fa5689b5b

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-2023-53146
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/usb/dvb-usb/dw2102.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/77cbd42d29de9ffc93d5529bab8813cde53af14c
	https://git.kernel.org/stable/c/ecbe6d011b95c7da59f014f8d26cb7245ed1e11e
	https://git.kernel.org/stable/c/beb9550494e7349f92b9eaa283256a5ad9b1c9be
	https://git.kernel.org/stable/c/97fdbdb750342cbc204befde976872fedb406ee6
	https://git.kernel.org/stable/c/903566208ae6bb9c0e7e54355ce75bf6cf72485d
	https://git.kernel.org/stable/c/08dfcbd03b2b7f918c4f87c6ff637054e510df74
	https://git.kernel.org/stable/c/fb28afab113a82b89ffec48c8155ec05b4f8cb5e
	https://git.kernel.org/stable/c/5ae544d94abc8ff77b1b9bf8774def3fa5689b5b