CVE-2026-74555

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

scsi: libsas: Fix HA resume deadlock and hisi_sas disk-wake race

Commit fbefe22811c3 ("scsi: libsas: Don't always drain event workqueue

for HA resume") introduced sas_resume_ha_no_sync() to avoid a deadlock:

the PHYE_RESUME_TIMEOUT handler, running on the HA event workqueue,

calls sas_deform_port() -> sas_destruct_devices(), which removes SCSI

devices and waits for the host to become runtime-active. But the host

cannot resume until sas_resume_ha() -> sas_drain_work() returns, and the

drain is blocked on that very handler.

However skipping the drain reintroduces a race: hisi_sas returns from

resume before all PHY UP work and libsas discovery work finish. The

controller may then autosuspend while disks are still waking up. The

disks issue IO to a suspended controller, the IO fails, and the disks

get disabled.

Fix the deadlock at its source by moving the PHYE_RESUME_TIMEOUT

notification to after sas_drain_work(). By then the host resume is about

to complete, so device removal through device_link no longer blocks on

the resume and the cycle is broken.

With the deadlock gone, restore sas_resume_ha() (the draining variant)

in hisi_sas and remove sas_resume_ha_no_sync().

The reorder is safe for the other libsas consumers (isci, pm8001,

aic94xx, mvsas). During suspend, sas_suspend_devices() calls

sas_notify_lldd_dev_gone() for each device, which sets dev->lldd_dev to

NULL. When scsi_unblock_requests re-enables I/O in resume, any I/O to a

timed-out phy's disk is immediately rejected by the LLDD before reaching

hardware: isci returns SAS_DEVICE_UNKNOWN (mapped to DID_BAD_TARGET),

and pm8001 returns SAS_PHY_DOWN (mapped to DID_NO_CONNECT). Both

complete directly via scsi_done() without entering SCSI EH. This is

identical in both the old and new ordering since lldd_dev_gone runs

during suspend, before resume. The reorder only affects when the

PHYE_RESUME_TIMEOUT handler runs (synchronized by sas_drain_work()

vs. asynchronous after resume returns), not whether I/O can reach the

device. aic94xx and mvsas do not register any PM ops and never reach

this code path.