linux-cve-announce - CVE-2025-21783: gpiolib: Fix crash on error in gpiochip_get

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Message-ID: <2025022608-CVE-2025-21783-2714@gregkh>
Date: Wed, 26 Feb 2025 18:17:39 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21783: gpiolib: Fix crash on error in gpiochip_get_ngpios()

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

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

gpiolib: Fix crash on error in gpiochip_get_ngpios()

The gpiochip_get_ngpios() uses chip_*() macros to print messages.
However these macros rely on gpiodev to be initialised and set,
which is not the case when called via bgpio_init(). In such a case
the printing messages will crash on NULL pointer dereference.
Replace chip_*() macros by the respective dev_*() ones to avoid
such crash.

The Linux kernel CVE team has assigned CVE-2025-21783 to this issue.


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

	Issue introduced in 6.6 with commit 55b2395e4e92adc492c6b30ac109eb78250dcd9d and fixed in 6.6.79 with commit 4d9b2b62e1136d10f661ec4c0c268140b6f74f4f
	Issue introduced in 6.6 with commit 55b2395e4e92adc492c6b30ac109eb78250dcd9d and fixed in 6.12.16 with commit a7052afa9eae2239e25943baa8817a6a56e8aa68
	Issue introduced in 6.6 with commit 55b2395e4e92adc492c6b30ac109eb78250dcd9d and fixed in 6.13.4 with commit 189fb76215e479c10731baabb50f1a352d2078f5
	Issue introduced in 6.6 with commit 55b2395e4e92adc492c6b30ac109eb78250dcd9d and fixed in 6.14-rc3 with commit 7b4aebeecbbd5b5fe73e35fad3f62ed21aa7ef44

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-2025-21783
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/gpio/gpiolib.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/4d9b2b62e1136d10f661ec4c0c268140b6f74f4f
	https://git.kernel.org/stable/c/a7052afa9eae2239e25943baa8817a6a56e8aa68
	https://git.kernel.org/stable/c/189fb76215e479c10731baabb50f1a352d2078f5
	https://git.kernel.org/stable/c/7b4aebeecbbd5b5fe73e35fad3f62ed21aa7ef44