CVE-2026-89590: accel/rocket: Fix error path handling in rocket_job_run()

CVE-2026-89590: accel/rocket: Fix error path handling in rocket_job_run()

[Greg Kroah-Hartman]

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

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

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

accel/rocket: Fix error path handling in rocket_job_run()

In rocket_job_run(), after taking an extra fence reference for
job->done_fence via dma_fence_get(), the error paths have three bugs:

- The dma_fence reference held by job->done_fence is never released,
  causing a reference leak.
- pm_runtime_get_sync() increments the usage counter even on failure,
  but the error path does not decrement it, leaking the runtime PM
  reference and preventing the NPU from suspending.
- A valid but unsignaled fence is returned to the DRM scheduler,
  which triggers WARN("Fence ... released with pending signals!")
  when the scheduler drops its reference.

Fix by replacing pm_runtime_get_sync() with pm_runtime_resume_and_get()
which auto-balances the usage counter on failure, releasing both fence
references on error, and returning ERR_PTR(ret) instead of the
unsignaled fence.

[tomeu: Refactored error paths to use consolidated goto labels]

The Linux kernel CVE team has assigned CVE-2026-89590 to this issue.


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

	Issue introduced in 6.18 with commit 0810d5ad88a18f1e6d549853a388ad0316f74e36 and fixed in 6.18.50 with commit 9ad8821573a36bcd18c84dbca3027802b0ea062f
	Issue introduced in 6.18 with commit 0810d5ad88a18f1e6d549853a388ad0316f74e36 and fixed in 7.2.4 with commit 7d6fa298c23495b805004f5f446497b661998fa5
	Issue introduced in 6.18 with commit 0810d5ad88a18f1e6d549853a388ad0316f74e36 and fixed in 7.3-rc1 with commit 9b2dedadf6a91ac3fc9fae268bb556a041222711

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-2026-89590
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/accel/rocket/rocket_job.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/9ad8821573a36bcd18c84dbca3027802b0ea062f
	https://git.kernel.org/stable/c/7d6fa298c23495b805004f5f446497b661998fa5
	https://git.kernel.org/stable/c/9b2dedadf6a91ac3fc9fae268bb556a041222711