linux-cve-announce - CVE-2022-50359: media: cx88: Fix a null-ptr-deref bug in buffer

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Message-ID: <2025091714-CVE-2022-50359-e9fb@gregkh>
Date: Wed, 17 Sep 2025 16:56:18 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50359: media: cx88: Fix a null-ptr-deref bug in buffer_prepare()

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

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

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

media: cx88: Fix a null-ptr-deref bug in buffer_prepare()

When the driver calls cx88_risc_buffer() to prepare the buffer, the
function call may fail, resulting in a empty buffer and null-ptr-deref
later in buffer_queue().

The following log can reveal it:

[   41.822762] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
[   41.824488] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
[   41.828027] RIP: 0010:buffer_queue+0xc2/0x500
[   41.836311] Call Trace:
[   41.836945]  __enqueue_in_driver+0x141/0x360
[   41.837262]  vb2_start_streaming+0x62/0x4a0
[   41.838216]  vb2_core_streamon+0x1da/0x2c0
[   41.838516]  __vb2_init_fileio+0x981/0xbc0
[   41.839141]  __vb2_perform_fileio+0xbf9/0x1120
[   41.840072]  vb2_fop_read+0x20e/0x400
[   41.840346]  v4l2_read+0x215/0x290
[   41.840603]  vfs_read+0x162/0x4c0

Fix this by checking the return value of cx88_risc_buffer()

[hverkuil: fix coding style issues]

The Linux kernel CVE team has assigned CVE-2022-50359 to this issue.


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

	Fixed in 4.9.331 with commit c76d04d2079a4b7369ce9a0e859c0f3f2250bcc1
	Fixed in 4.14.296 with commit 10c99d1c46ea9cd940029e17bab11d021f315c21
	Fixed in 4.19.262 with commit 4befc7ffa18ef9a4b70d854465313a345a06862f
	Fixed in 5.4.220 with commit 9181af2dbf06e7f432e5dbe88d10b22343e851b9
	Fixed in 5.10.150 with commit c2257c8a501537afab276c306cb717b7260276e1
	Fixed in 5.15.75 with commit 6f21976095c1e92454ab030976f95f40d652351b
	Fixed in 5.19.17 with commit 704838040f3bdb4aa07ff4f26505a666a3defcfe
	Fixed in 6.0.3 with commit 644d5a87ab1863eb606526ea743021752a17e9cb
	Fixed in 6.1 with commit 2b064d91440b33fba5b452f2d1b31f13ae911d71

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-2022-50359
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/cx88/cx88-vbi.c
	drivers/media/pci/cx88/cx88-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/c76d04d2079a4b7369ce9a0e859c0f3f2250bcc1
	https://git.kernel.org/stable/c/10c99d1c46ea9cd940029e17bab11d021f315c21
	https://git.kernel.org/stable/c/4befc7ffa18ef9a4b70d854465313a345a06862f
	https://git.kernel.org/stable/c/9181af2dbf06e7f432e5dbe88d10b22343e851b9
	https://git.kernel.org/stable/c/c2257c8a501537afab276c306cb717b7260276e1
	https://git.kernel.org/stable/c/6f21976095c1e92454ab030976f95f40d652351b
	https://git.kernel.org/stable/c/704838040f3bdb4aa07ff4f26505a666a3defcfe
	https://git.kernel.org/stable/c/644d5a87ab1863eb606526ea743021752a17e9cb
	https://git.kernel.org/stable/c/2b064d91440b33fba5b452f2d1b31f13ae911d71