linux-cve-announce - CVE-2024-50109: md/raid10: fix null ptr dereference in raid10

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Message-ID: <2024110554-CVE-2024-50109-b93c@gregkh>
Date: Tue,  5 Nov 2024 18:10:58 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50109: md/raid10: fix null ptr dereference in raid10_size()

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

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

md/raid10: fix null ptr dereference in raid10_size()

In raid10_run() if raid10_set_queue_limits() succeed, the return value
is set to zero, and if following procedures failed raid10_run() will
return zero while mddev->private is still NULL, causing null ptr
dereference in raid10_size().

Fix the problem by only overwrite the return value if
raid10_set_queue_limits() failed.

The Linux kernel CVE team has assigned CVE-2024-50109 to this issue.


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

	Issue introduced in 6.9 with commit 3d8466ba68d4 and fixed in 6.11.6 with commit b3054db2fd2d
	Issue introduced in 6.9 with commit 3d8466ba68d4 and fixed in 6.12-rc5 with commit 825711e00117

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-2024-50109
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/md/raid10.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/b3054db2fd2d35f2eb3b4b5fb1407792f465391c
	https://git.kernel.org/stable/c/825711e00117fc686ab89ac36a9a7b252dc349c6