linux-cve-announce - CVE-2022-49496: media: mediatek: vcodec: prevent kernel crash when rmmod mtk-vcodec-dec.ko

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Message-ID: <2025022607-CVE-2022-49496-a532@gregkh>
Date: Wed, 26 Feb 2025 03:12:50 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49496: media: mediatek: vcodec: prevent kernel crash when rmmod mtk-vcodec-dec.ko

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

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

media: mediatek: vcodec: prevent kernel crash when rmmod mtk-vcodec-dec.ko

If the driver support subdev mode, the parameter "dev->pm.dev" will be
NULL in mtk_vcodec_dec_remove. Kernel will crash when try to rmmod
mtk-vcodec-dec.ko.

[ 4380.702726] pc : do_raw_spin_trylock+0x4/0x80
[ 4380.707075] lr : _raw_spin_lock_irq+0x90/0x14c
[ 4380.711509] sp : ffff80000819bc10
[ 4380.714811] x29: ffff80000819bc10 x28: ffff3600c03e4000 x27: 0000000000000000
[ 4380.721934] x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000
[ 4380.729057] x23: ffff3600c0f34930 x22: ffffd5e923549000 x21: 0000000000000220
[ 4380.736179] x20: 0000000000000208 x19: ffffd5e9213e8ebc x18: 0000000000000020
[ 4380.743298] x17: 0000002000000000 x16: ffffd5e9213e8e90 x15: 696c346f65646976
[ 4380.750420] x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000040
[ 4380.757542] x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000
[ 4380.764664] x8 : 0000000000000000 x7 : ffff3600c7273ae8 x6 : ffffd5e9213e8ebc
[ 4380.771786] x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000
[ 4380.778908] x2 : 0000000000000000 x1 : ffff3600c03e4000 x0 : 0000000000000208
[ 4380.786031] Call trace:
[ 4380.788465]  do_raw_spin_trylock+0x4/0x80
[ 4380.792462]  __pm_runtime_disable+0x2c/0x1b0
[ 4380.796723]  mtk_vcodec_dec_remove+0x5c/0xa0 [mtk_vcodec_dec]
[ 4380.802466]  platform_remove+0x2c/0x60
[ 4380.806204]  __device_release_driver+0x194/0x250
[ 4380.810810]  driver_detach+0xc8/0x15c
[ 4380.814462]  bus_remove_driver+0x5c/0xb0
[ 4380.818375]  driver_unregister+0x34/0x64
[ 4380.822288]  platform_driver_unregister+0x18/0x24
[ 4380.826979]  mtk_vcodec_dec_driver_exit+0x1c/0x888 [mtk_vcodec_dec]
[ 4380.833240]  __arm64_sys_delete_module+0x190/0x224
[ 4380.838020]  invoke_syscall+0x48/0x114
[ 4380.841760]  el0_svc_common.constprop.0+0x60/0x11c
[ 4380.846540]  do_el0_svc+0x28/0x90
[ 4380.849844]  el0_svc+0x4c/0x100
[ 4380.852975]  el0t_64_sync_handler+0xec/0xf0
[ 4380.857148]  el0t_64_sync+0x190/0x194
[ 4380.860801] Code: 94431515 17ffffca d503201f d503245f (b9400004)

The Linux kernel CVE team has assigned CVE-2022-49496 to this issue.


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

	Fixed in 5.18.3 with commit 1fa37b00dc55a061a3eb82e378849862b4aeca9d
	Fixed in 5.19 with commit c10c0086db688c95bb4e0e378e523818dff1551d

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-2022-49496
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/media/platform/mediatek/vcodec/mtk_vcodec_dec_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/1fa37b00dc55a061a3eb82e378849862b4aeca9d
	https://git.kernel.org/stable/c/c10c0086db688c95bb4e0e378e523818dff1551d