linux-cve-announce - CVE-2022-49830: drm/drv: Fix potential memory leak in drm_dev

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Message-ID: <2025050136-CVE-2022-49830-70c0@gregkh>
Date: Thu,  1 May 2025 16:10:20 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49830: drm/drv: Fix potential memory leak in drm_dev_init()

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

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

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

drm/drv: Fix potential memory leak in drm_dev_init()

drm_dev_init() will add drm_dev_init_release() as a callback. When
drmm_add_action() failed, the release function won't be added. As the
result, the ref cnt added by device_get() in drm_dev_init() won't be put
by drm_dev_init_release(), which leads to the memleak. Use
drmm_add_action_or_reset() instead of drmm_add_action() to prevent
memleak.

unreferenced object 0xffff88810bc0c800 (size 2048):
  comm "modprobe", pid 8322, jiffies 4305809845 (age 15.292s)
  hex dump (first 32 bytes):
    e8 cc c0 0b 81 88 ff ff ff ff ff ff 00 00 00 00  ................
    20 24 3c 0c 81 88 ff ff 18 c8 c0 0b 81 88 ff ff   $<.............
  backtrace:
    [<000000007251f72d>] __kmalloc+0x4b/0x1c0
    [<0000000045f21f26>] platform_device_alloc+0x2d/0xe0
    [<000000004452a479>] platform_device_register_full+0x24/0x1c0
    [<0000000089f4ea61>] 0xffffffffa0736051
    [<00000000235b2441>] do_one_initcall+0x7a/0x380
    [<0000000001a4a177>] do_init_module+0x5c/0x230
    [<000000002bf8a8e2>] load_module+0x227d/0x2420
    [<00000000637d6d0a>] __do_sys_finit_module+0xd5/0x140
    [<00000000c99fc324>] do_syscall_64+0x3f/0x90
    [<000000004d85aa77>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

The Linux kernel CVE team has assigned CVE-2022-49830 to this issue.


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

	Issue introduced in 5.8 with commit 2cbf7fc6718b9443ecd6261308c6348d8ffcccae and fixed in 5.10.156 with commit c47a823ea186263ab69cfb665327b7f72cb5e779
	Issue introduced in 5.8 with commit 2cbf7fc6718b9443ecd6261308c6348d8ffcccae and fixed in 5.15.80 with commit 07e56de8766fe5be67252596244b84ac0ec0de91
	Issue introduced in 5.8 with commit 2cbf7fc6718b9443ecd6261308c6348d8ffcccae and fixed in 6.0.10 with commit bd8d1335e6e70a396094ef98913b513140c0b86b
	Issue introduced in 5.8 with commit 2cbf7fc6718b9443ecd6261308c6348d8ffcccae and fixed in 6.1 with commit ff963634f7b2e0dc011349abb3fb81a0d074f443

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-2022-49830
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/gpu/drm/drm_drv.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/c47a823ea186263ab69cfb665327b7f72cb5e779
	https://git.kernel.org/stable/c/07e56de8766fe5be67252596244b84ac0ec0de91
	https://git.kernel.org/stable/c/bd8d1335e6e70a396094ef98913b513140c0b86b
	https://git.kernel.org/stable/c/ff963634f7b2e0dc011349abb3fb81a0d074f443