linux-cve-announce - CVE-2025-21832: block: don't revert iter for -EIOCBQUEUED

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Message-ID: <2025030635-CVE-2025-21832-943e@gregkh>
Date: Thu,  6 Mar 2025 17:22:38 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21832: block: don't revert iter for -EIOCBQUEUED

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

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

block: don't revert iter for -EIOCBQUEUED

blkdev_read_iter() has a few odd checks, like gating the position and
count adjustment on whether or not the result is bigger-than-or-equal to
zero (where bigger than makes more sense), and not checking the return
value of blkdev_direct_IO() before doing an iov_iter_revert(). The
latter can lead to attempting to revert with a negative value, which
when passed to iov_iter_revert() as an unsigned value will lead to
throwing a WARN_ON() because unroll is bigger than MAX_RW_COUNT.

Be sane and don't revert for -EIOCBQUEUED, like what is done in other
spots.

The Linux kernel CVE team has assigned CVE-2025-21832 to this issue.


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

	Fixed in 6.1.129 with commit 6c26619effb1b4cb7d20b4e666ab8f71f6a53ccb
	Fixed in 6.6.78 with commit 84671b0630ccb46ae9f1f99a45c7d63ffcd6a474
	Fixed in 6.12.14 with commit 68f16d3034a06661245ecd22f0d586a8b4e7c473
	Fixed in 6.13.3 with commit a58f136bad29f9ae721a29d98c042fddbee22f77
	Fixed in 6.14-rc1 with commit b13ee668e8280ca5b07f8ce2846b9957a8a10853

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-2025-21832
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:
	block/fops.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/6c26619effb1b4cb7d20b4e666ab8f71f6a53ccb
	https://git.kernel.org/stable/c/84671b0630ccb46ae9f1f99a45c7d63ffcd6a474
	https://git.kernel.org/stable/c/68f16d3034a06661245ecd22f0d586a8b4e7c473
	https://git.kernel.org/stable/c/a58f136bad29f9ae721a29d98c042fddbee22f77
	https://git.kernel.org/stable/c/b13ee668e8280ca5b07f8ce2846b9957a8a10853