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[LTS 8.6] KVM: arm64: vgic-its: Avoid potential UAF in LPI translation cache #455

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Merged
merged 1 commit into from
Aug 6, 2025
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[LTS 8.6] KVM: arm64: vgic-its: Avoid potential UAF in LPI translation cache #455

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5 changes: 5 additions & 0 deletions arch/arm64/kvm/vgic/vgic-its.c
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Original file line number Diff line number Diff line change
Expand Up @@ -595,7 +595,11 @@ static struct vgic_irq *vgic_its_check_cache(struct kvm *kvm, phys_addr_t db,
unsigned long flags;

raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);

irq = __vgic_its_check_cache(dist, db, devid, eventid);
if (irq)
vgic_get_irq_kref(irq);

raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);

return irq;
Expand Down Expand Up @@ -774,6 +778,7 @@ int vgic_its_inject_cached_translation(struct kvm *kvm, struct kvm_msi *msi)
raw_spin_lock_irqsave(&irq->irq_lock, flags);
irq->pending_latch = true;
vgic_queue_irq_unlock(kvm, irq, flags);
vgic_put_irq(kvm, irq);

return 0;
}
Expand Down