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

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Summary

CVECVE-2026-74555
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:18:00 UTC
Updated2026-08-15 13:18:00 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected fbefe22811c3140a686e407e114789ebf328a9a2 e50a6523a603594a6d92cdecfe11997d639410a3 git Not specified
CNA Linux Linux affected fbefe22811c3140a686e407e114789ebf328a9a2 c391b5899dd46485a5893696c12ae3e95a3a7325 git Not specified
CNA Linux Linux affected fbefe22811c3140a686e407e114789ebf328a9a2 9e24b47ef81d43b3fb1b14294f09991640c79fcc git Not specified
CNA Linux Linux affected fbefe22811c3140a686e407e114789ebf328a9a2 b9c44a14062093e9fc2d6bddc696cfceadb482d7 git Not specified
CNA Linux Linux affected fbefe22811c3140a686e407e114789ebf328a9a2 3dbbbf656b850c9c8de05df6ad4a1dfc6ff02845 git Not specified
CNA Linux Linux affected 5.17 Not specified
CNA Linux Linux unaffected 5.17 semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3dbbbf656b850c9c8de05df6ad4a1dfc6ff02845 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e50a6523a603594a6d92cdecfe11997d639410a3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c391b5899dd46485a5893696c12ae3e95a3a7325 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9e24b47ef81d43b3fb1b14294f09991640c79fcc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b9c44a14062093e9fc2d6bddc696cfceadb482d7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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