Subject: CVE-2024-49986: platform/x86: x86-android-tablets: Fix use after free on platform_device_register() errors

From: Greg Kroah-Hartman <[email-masked]>

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

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

platform/x86: x86-android-tablets: Fix use after free on platform_device_register() errors

x86_android_tablet_remove() frees the pdevs[] array, so it should not
be used after calling x86_android_tablet_remove().

When platform_device_register() fails, store the pdevs[x] PTR_ERR() value
into the local ret variable before calling x86_android_tablet_remove()
to avoid using pdevs[] after it has been freed.

The Linux kernel CVE team has assigned CVE-2024-49986 to this issue.

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

	Issue introduced in 5.17 with commit 5eba0141206e and fixed in 6.6.55 with commit aac871e493fc
	Issue introduced in 5.17 with commit 5eba0141206e and fixed in 6.10.14 with commit f08adc5177bd
	Issue introduced in 5.17 with commit 5eba0141206e and fixed in 6.11.3 with commit 73a98cf79e4d
	Issue introduced in 5.17 with commit 5eba0141206e and fixed in 6.12-rc2 with commit 2fae3129c0c0

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-2024-49986
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/platform/x86/x86-android-tablets/core.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/aac871e493fc8809e60209d9899b1af07e9dbfc8
	https://git.kernel.org/stable/c/f08adc5177bd4343df09033f62ab562c09ba7f7d
	https://git.kernel.org/stable/c/73a98cf79e4dbfa3d0c363e826c65aae089b313c
	https://git.kernel.org/stable/c/2fae3129c0c08e72b1fe93e61fd8fd203252094a