CVE-2026-43397: drm/bridge: samsung-dsim: Fix memory leak in error path

CVE-2026-43397: drm/bridge: samsung-dsim: Fix memory leak in error path

[Greg Kroah-Hartman]

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

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

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

drm/bridge: samsung-dsim: Fix memory leak in error path

In samsung_dsim_host_attach(), drm_bridge_add() is called to add the
bridge. However, if samsung_dsim_register_te_irq() or
pdata->host_ops->attach() fails afterwards, the function returns
without removing the bridge, causing a memory leak.

Fix this by adding proper error handling with goto labels to ensure
drm_bridge_remove() is called in all error paths. Also ensure that
samsung_dsim_unregister_te_irq() is called if the attach operation
fails after the TE IRQ has been registered.

samsung_dsim_unregister_te_irq() function is moved without changes
to be before samsung_dsim_host_attach() to avoid forward declaration.

The Linux kernel CVE team has assigned CVE-2026-43397 to this issue.


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

	Issue introduced in 6.4 with commit e7447128ca4a250374d6721ee98e3e3cf99551a6 and fixed in 6.6.130 with commit 98310fe3a2a79671b739a5344c1a11d74c503e25
	Issue introduced in 6.4 with commit e7447128ca4a250374d6721ee98e3e3cf99551a6 and fixed in 6.12.78 with commit 0b07f7d2c5a4078c2f1c11bb36685084fe4e5c95
	Issue introduced in 6.4 with commit e7447128ca4a250374d6721ee98e3e3cf99551a6 and fixed in 6.18.19 with commit e6d779654cda63d632bd8dfcdcabd125057e30a5
	Issue introduced in 6.4 with commit e7447128ca4a250374d6721ee98e3e3cf99551a6 and fixed in 6.19.9 with commit a40b92fb4b26d4cb1b5e439e55a56db7e79a82d1
	Issue introduced in 6.4 with commit e7447128ca4a250374d6721ee98e3e3cf99551a6 and fixed in 7.0 with commit 803ec1faf7c1823e6e3b1f2aaa81be18528c9436

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-2026-43397
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/bridge/samsung-dsim.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/98310fe3a2a79671b739a5344c1a11d74c503e25
	https://git.kernel.org/stable/c/0b07f7d2c5a4078c2f1c11bb36685084fe4e5c95
	https://git.kernel.org/stable/c/e6d779654cda63d632bd8dfcdcabd125057e30a5
	https://git.kernel.org/stable/c/a40b92fb4b26d4cb1b5e439e55a56db7e79a82d1
	https://git.kernel.org/stable/c/803ec1faf7c1823e6e3b1f2aaa81be18528c9436