linux-cve-announce - CVE-2024-50239: phy: qcom: qmp-usb-legacy: fix NULL-deref on runtime suspend

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Message-ID: <2024110932-CVE-2024-50239-590e@gregkh>
Date: Sat,  9 Nov 2024 11:15:47 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50239: phy: qcom: qmp-usb-legacy: fix NULL-deref on runtime suspend

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

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

phy: qcom: qmp-usb-legacy: fix NULL-deref on runtime suspend

Commit 413db06c05e7 ("phy: qcom-qmp-usb: clean up probe initialisation")
removed most users of the platform device driver data from the
qcom-qmp-usb driver, but mistakenly also removed the initialisation
despite the data still being used in the runtime PM callbacks. This bug
was later reproduced when the driver was copied to create the
qmp-usb-legacy driver.

Restore the driver data initialisation at probe to avoid a NULL-pointer
dereference on runtime suspend.

Apparently no one uses runtime PM, which currently needs to be enabled
manually through sysfs, with these drivers.

The Linux kernel CVE team has assigned CVE-2024-50239 to this issue.

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

	Issue introduced in 6.6 with commit e464a3180a43 and fixed in 6.6.60 with commit 7e8066811a2c
	Issue introduced in 6.6 with commit e464a3180a43 and fixed in 6.11.7 with commit b1cffd00daa9
	Issue introduced in 6.6 with commit e464a3180a43 and fixed in 6.12-rc6 with commit 29240130ab77

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-2024-50239
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/phy/qualcomm/phy-qcom-qmp-usb-legacy.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/7e8066811a2c43fbb5f53c2c26d389e4bab9da34
	https://git.kernel.org/stable/c/b1cffd00daa9cf499b49a0da698eff5032914f6e
	https://git.kernel.org/stable/c/29240130ab77c80bea1464317ae2a5fd29c16a0c