linux-cve-announce - CVE-2024-56700: media: wl128x: Fix atomicity violation in fmc_send

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Message-ID: <2024122836-CVE-2024-56700-d3d1@gregkh>
Date: Sat, 28 Dec 2024 10:45:52 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-56700: media: wl128x: Fix atomicity violation in fmc_send_cmd()

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

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

media: wl128x: Fix atomicity violation in fmc_send_cmd()

Atomicity violation occurs when the fmc_send_cmd() function is executed
simultaneously with the modification of the fmdev->resp_skb value.
Consider a scenario where, after passing the validity check within the
function, a non-null fmdev->resp_skb variable is assigned a null value.
This results in an invalid fmdev->resp_skb variable passing the validity
check. As seen in the later part of the function, skb = fmdev->resp_skb;
when the invalid fmdev->resp_skb passes the check, a null pointer
dereference error may occur at line 478, evt_hdr = (void *)skb->data;

To address this issue, it is recommended to include the validity check of
fmdev->resp_skb within the locked section of the function. This
modification ensures that the value of fmdev->resp_skb does not change
during the validation process, thereby maintaining its validity.

This possible bug is found by an experimental static analysis tool
developed by our team. This tool analyzes the locking APIs
to extract function pairs that can be concurrently executed, and then
analyzes the instructions in the paired functions to identify possible
concurrency bugs including data races and atomicity violations.

The Linux kernel CVE team has assigned CVE-2024-56700 to this issue.


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

	Issue introduced in 2.6.39 with commit e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 and fixed in 4.19.325 with commit d16109c9fdc1b8cea4fe63b42e06e926c3f68990
	Issue introduced in 2.6.39 with commit e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 and fixed in 5.4.287 with commit 3c818ad07e964bca3d27adac1e1f50e1e3c9180e
	Issue introduced in 2.6.39 with commit e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 and fixed in 5.10.231 with commit d7408a052aa1b4f6fb6f1c7a8877b84017a07ac9
	Issue introduced in 2.6.39 with commit e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 and fixed in 5.15.174 with commit ed228b74d8a500380150965d5becabf9a1e33141
	Issue introduced in 2.6.39 with commit e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 and fixed in 6.1.120 with commit 372dc9509122e5d45d4c12978e31c3c7d00aaca4
	Issue introduced in 2.6.39 with commit e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 and fixed in 6.6.64 with commit 378ce4e08ca2b1ac7bbf1d57b68643ca4226c5f8
	Issue introduced in 2.6.39 with commit e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 and fixed in 6.11.11 with commit 2e63c908de357048180516b84740ed62dac0b269
	Issue introduced in 2.6.39 with commit e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 and fixed in 6.12.2 with commit 80a3b2ee01eecf22dfa06968b3cde92c691dea10
	Issue introduced in 2.6.39 with commit e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6 and fixed in 6.13-rc1 with commit ca59f9956d4519ab18ab2270be47c6b8c6ced091

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-2024-56700
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/radio/wl128x/fmdrv_common.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/d16109c9fdc1b8cea4fe63b42e06e926c3f68990
	https://git.kernel.org/stable/c/3c818ad07e964bca3d27adac1e1f50e1e3c9180e
	https://git.kernel.org/stable/c/d7408a052aa1b4f6fb6f1c7a8877b84017a07ac9
	https://git.kernel.org/stable/c/ed228b74d8a500380150965d5becabf9a1e33141
	https://git.kernel.org/stable/c/372dc9509122e5d45d4c12978e31c3c7d00aaca4
	https://git.kernel.org/stable/c/378ce4e08ca2b1ac7bbf1d57b68643ca4226c5f8
	https://git.kernel.org/stable/c/2e63c908de357048180516b84740ed62dac0b269
	https://git.kernel.org/stable/c/80a3b2ee01eecf22dfa06968b3cde92c691dea10
	https://git.kernel.org/stable/c/ca59f9956d4519ab18ab2270be47c6b8c6ced091