CVE-2026-80650: media: atomisp: gc2235: fix UAF and memory leak

CVE-2026-80650: media: atomisp: gc2235: fix UAF and memory leak

[Greg Kroah-Hartman]

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

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

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

media: atomisp: gc2235: fix UAF and memory leak

gc2235_probe() handles its error paths incorrectly.

If media_entity_pads_init() fails, gc2235_remove() is called, which
tears down the subdev and frees dev, but then still falls through to
atomisp_register_i2c_module(). This results in use-after-free.

If atomisp_register_i2c_module() fails, the media entity and control
handler are left initialized and dev is leaked.

gc2235_remove() unconditionally calls media_entity_cleanup() and
v4l2_ctrl_handler_free(), but these are not initialized at every
error path in gc2235_probe().

Replace gc2235_remove() calls in the probe error paths with explicit
unwind labels that free only the resources initialized at each point
of failure, in reverse order of initialization.

The Linux kernel CVE team has assigned CVE-2026-80650 to this issue.


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

	Issue introduced in 4.12 with commit a49d25364dfb9f8a64037488a39ab1f56c5fa419 and fixed in 6.12.97 with commit fdbb8e55578b4ab647fa58827a9dd8730d7f4add
	Issue introduced in 4.12 with commit a49d25364dfb9f8a64037488a39ab1f56c5fa419 and fixed in 6.18.40 with commit d57e67ea48e4d095052f2b14d8dd7593621f862f
	Issue introduced in 4.12 with commit a49d25364dfb9f8a64037488a39ab1f56c5fa419 and fixed in 7.1.5 with commit f614bf0a64aa1cb7444d152a96798a6bf1d49e1f
	Issue introduced in 4.12 with commit a49d25364dfb9f8a64037488a39ab1f56c5fa419 and fixed in 7.2 with commit 628f763aee0047ff44974388d6f70f75a763026b

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-2026-80650
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/staging/media/atomisp/i2c/atomisp-gc2235.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/fdbb8e55578b4ab647fa58827a9dd8730d7f4add
	https://git.kernel.org/stable/c/d57e67ea48e4d095052f2b14d8dd7593621f862f
	https://git.kernel.org/stable/c/f614bf0a64aa1cb7444d152a96798a6bf1d49e1f
	https://git.kernel.org/stable/c/628f763aee0047ff44974388d6f70f75a763026b