CVE-2026-68210: media: stm32: dcmi: unregister notifier on probe failure

From: Greg Kroah-Hartman <[email protected]>

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

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

media: stm32: dcmi: unregister notifier on probe failure

dcmi_graph_init() registers the async notifier before dcmi_probe() toggles
the reset line. If reset_control_assert() or reset_control_deassert()
fails afterwards, probe returns through err_cleanup and the driver core
will not call dcmi_remove().

Unregister the notifier before cleaning it up on that error path,
matching the successful remove path and the V4L2 async notifier lifetime
rules.

[hverkuil: added Fixes tag]

The Linux kernel CVE team has assigned CVE-2026-68210 to this issue.


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

	Issue introduced in 4.20 with commit d079f94c90469f413920b9f2b201537fac2ceb06 and fixed in 6.6.148 with commit 37ff63c5d7119cbc5c6bacdcc658add6008a8e1f
	Issue introduced in 4.20 with commit d079f94c90469f413920b9f2b201537fac2ceb06 and fixed in 6.12.101 with commit 6c6f22b7e6cbc4e8c1e359fc9b190419391c3db7
	Issue introduced in 4.20 with commit d079f94c90469f413920b9f2b201537fac2ceb06 and fixed in 6.18.42 with commit 931abe1deb65b919d23fa203d7f6d6fbd4fccd8e
	Issue introduced in 4.20 with commit d079f94c90469f413920b9f2b201537fac2ceb06 and fixed in 7.1.6 with commit 4b7ee504969e074725e439c949f2483e5fa5572a
	Issue introduced in 4.20 with commit d079f94c90469f413920b9f2b201537fac2ceb06 and fixed in 7.2-rc1 with commit 084973ebd67b28f0945c5d45408f86c58b540110

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-2026-68210
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/st/stm32/stm32-dcmi.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/37ff63c5d7119cbc5c6bacdcc658add6008a8e1f
	https://git.kernel.org/stable/c/6c6f22b7e6cbc4e8c1e359fc9b190419391c3db7
	https://git.kernel.org/stable/c/931abe1deb65b919d23fa203d7f6d6fbd4fccd8e
	https://git.kernel.org/stable/c/4b7ee504969e074725e439c949f2483e5fa5572a
	https://git.kernel.org/stable/c/084973ebd67b28f0945c5d45408f86c58b540110