linux-cve-announce - CVE-2024-56769: media: dvb-frontends: dib3000mb: fix uninit-value in dib3000_write

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Message-ID: <2025010657-CVE-2024-56769-021a@gregkh>
Date: Mon,  6 Jan 2025 17:21:03 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-56769: media: dvb-frontends: dib3000mb: fix uninit-value in dib3000_write_reg

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

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

media: dvb-frontends: dib3000mb: fix uninit-value in dib3000_write_reg

Syzbot reports [1] an uninitialized value issue found by KMSAN in
dib3000_read_reg().

Local u8 rb[2] is used in i2c_transfer() as a read buffer; in case
that call fails, the buffer may end up with some undefined values.

Since no elaborate error handling is expected in dib3000_write_reg(),
simply zero out rb buffer to mitigate the problem.

[1] Syzkaller report
dvb-usb: bulk message failed: -22 (6/0)
=====================================================
BUG: KMSAN: uninit-value in dib3000mb_attach+0x2d8/0x3c0 drivers/media/dvb-frontends/dib3000mb.c:758
 dib3000mb_attach+0x2d8/0x3c0 drivers/media/dvb-frontends/dib3000mb.c:758
 dibusb_dib3000mb_frontend_attach+0x155/0x2f0 drivers/media/usb/dvb-usb/dibusb-mb.c:31
 dvb_usb_adapter_frontend_init+0xed/0x9a0 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:290
 dvb_usb_adapter_init drivers/media/usb/dvb-usb/dvb-usb-init.c:90 [inline]
 dvb_usb_init drivers/media/usb/dvb-usb/dvb-usb-init.c:186 [inline]
 dvb_usb_device_init+0x25a8/0x3760 drivers/media/usb/dvb-usb/dvb-usb-init.c:310
 dibusb_probe+0x46/0x250 drivers/media/usb/dvb-usb/dibusb-mb.c:110
...
Local variable rb created at:
 dib3000_read_reg+0x86/0x4e0 drivers/media/dvb-frontends/dib3000mb.c:54
 dib3000mb_attach+0x123/0x3c0 drivers/media/dvb-frontends/dib3000mb.c:758
...

The Linux kernel CVE team has assigned CVE-2024-56769 to this issue.

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

	Issue introduced in 2.6.19 with commit 74340b0a8bc60b400c7e5fe4950303aa6f914d16 and fixed in 6.1.123 with commit 3876e3a1c31a58a352c6bf5d2a90e3304445a637
	Issue introduced in 2.6.19 with commit 74340b0a8bc60b400c7e5fe4950303aa6f914d16 and fixed in 6.6.69 with commit 1d6de21f00293d819b5ca6dbe75ff1f3b6392140
	Issue introduced in 2.6.19 with commit 74340b0a8bc60b400c7e5fe4950303aa6f914d16 and fixed in 6.12.8 with commit c1197c1457bb7098cf46366e898eb52b41b6876a
	Issue introduced in 2.6.19 with commit 74340b0a8bc60b400c7e5fe4950303aa6f914d16 and fixed in 6.13-rc4 with commit 2dd59fe0e19e1ab955259978082b62e5751924c7

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-2024-56769
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/dvb-frontends/dib3000mb.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/3876e3a1c31a58a352c6bf5d2a90e3304445a637
	https://git.kernel.org/stable/c/1d6de21f00293d819b5ca6dbe75ff1f3b6392140
	https://git.kernel.org/stable/c/c1197c1457bb7098cf46366e898eb52b41b6876a
	https://git.kernel.org/stable/c/2dd59fe0e19e1ab955259978082b62e5751924c7