CVE-2026-68430: drm/amdgpu/gfx8: drop unecessary BUG_ON()

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

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

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

drm/amdgpu/gfx8: drop unecessary BUG_ON()

There's no need to crash the kernel for this case.

(cherry picked from commit 4d7c25208ca612b754f3bf39e9f16e725b828891)

The Linux kernel CVE team has assigned CVE-2026-68430 to this issue.


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

	Fixed in 6.6.148 with commit ab05af6c345bc8460052c60de657ce6d4a2386f7
	Fixed in 6.12.101 with commit 2404600dca5c0979485c6f2d9c62bd356a98870a
	Fixed in 6.18.42 with commit f70bd5235d9efc2ee2f70293eea51888c5f2a54d
	Fixed in 7.1.6 with commit db85aa861b8214fa0d1d8405c01488f604a455a0
	Fixed in 7.2-rc2 with commit 84a1a8a952ab4b8c23c5dd1f2eea4049cb4914f5

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-2026-68430
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/amd/amdgpu/gfx_v8_0.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/ab05af6c345bc8460052c60de657ce6d4a2386f7
	https://git.kernel.org/stable/c/2404600dca5c0979485c6f2d9c62bd356a98870a
	https://git.kernel.org/stable/c/f70bd5235d9efc2ee2f70293eea51888c5f2a54d
	https://git.kernel.org/stable/c/db85aa861b8214fa0d1d8405c01488f604a455a0
	https://git.kernel.org/stable/c/84a1a8a952ab4b8c23c5dd1f2eea4049cb4914f5