linux-cve-announce - CVE-2022-50304: mtd: core: fix possible resource leak in init

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Message-ID: <2025091558-CVE-2022-50304-4b20@gregkh>
Date: Mon, 15 Sep 2025 16:46:06 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50304: mtd: core: fix possible resource leak in init_mtd()

From: Greg Kroah-Hartman <gregkh@...nel.org>

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

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

mtd: core: fix possible resource leak in init_mtd()

I got the error report while inject fault in init_mtd():

sysfs: cannot create duplicate filename '/devices/virtual/bdi/mtd-0'
Call Trace:
 <TASK>
 dump_stack_lvl+0x67/0x83
 sysfs_warn_dup+0x60/0x70
 sysfs_create_dir_ns+0x109/0x120
 kobject_add_internal+0xce/0x2f0
 kobject_add+0x98/0x110
 device_add+0x179/0xc00
 device_create_groups_vargs+0xf4/0x100
 device_create+0x7b/0xb0
 bdi_register_va.part.13+0x58/0x2d0
 bdi_register+0x9b/0xb0
 init_mtd+0x62/0x171 [mtd]
 do_one_initcall+0x6c/0x3c0
 do_init_module+0x58/0x222
 load_module+0x268e/0x27d0
 __do_sys_finit_module+0xd5/0x140
 do_syscall_64+0x37/0x90
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
 </TASK>
kobject_add_internal failed for mtd-0 with -EEXIST, don't try to register
	things with the same name in the same directory.
Error registering mtd class or bdi: -17

If init_mtdchar() fails in init_mtd(), mtd_bdi will not be unregistered,
as a result, we can't load the mtd module again, to fix this by calling
bdi_unregister(mtd_bdi) after out_procfs label.

The Linux kernel CVE team has assigned CVE-2022-50304 to this issue.


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

	Issue introduced in 4.10 with commit 445caaa20c4d6da74f426464f90513b81157ad77 and fixed in 6.0.16 with commit 78816504100cbd8e6836df9f58cc4fbb8b262f1c
	Issue introduced in 4.10 with commit 445caaa20c4d6da74f426464f90513b81157ad77 and fixed in 6.1.2 with commit 26c304a3f136009c5a2a04e2bf3ac6aa25aabcb4
	Issue introduced in 4.10 with commit 445caaa20c4d6da74f426464f90513b81157ad77 and fixed in 6.2 with commit 1aadf01e5076b9ab6bf294b9622335c651314895

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-2022-50304
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/mtd/mtdcore.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/78816504100cbd8e6836df9f58cc4fbb8b262f1c
	https://git.kernel.org/stable/c/26c304a3f136009c5a2a04e2bf3ac6aa25aabcb4
	https://git.kernel.org/stable/c/1aadf01e5076b9ab6bf294b9622335c651314895