KVM: arm64: vgic-its: Test for valid IRQ in its_sync_lpi_pending_table()

jira LE-1907
Rebuild_History Non-Buildable kernel-5.14.0-427.28.1.el9_4
commit-author Oliver Upton <oliver.upton@linux.dev>
commit 8d3a7df

vgic_get_irq() may not return a valid descriptor if there is no ITS that
holds a valid translation for the specified INTID. If that is the case,
it is safe to silently ignore it and continue processing the LPI pending
table.

	Cc: stable@vger.kernel.org
Fixes: 33d3bc9 ("KVM: arm64: vgic-its: Read initial LPI pending table")
	Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240221092732.4126848-2-oliver.upton@linux.dev
	Signed-off-by: Marc Zyngier <maz@kernel.org>
(cherry picked from commit 8d3a7df)
	Signed-off-by: Jonathan Maple <jmaple@ciq.com>

Author: PlaidCat

arch/arm64/kvm/vgic/vgic-its.c

@@ -468,6 +468,9 @@ static int its_sync_lpi_pending_table(struct kvm_vcpu *vcpu)
 		}
 
 		irq = vgic_get_irq(vcpu->kvm, NULL, intids[i]);
+		if (!irq)
+			continue;
+
 		raw_spin_lock_irqsave(&irq->irq_lock, flags);
 		irq->pending_latch = pendmask & (1U << bit_nr);
 		vgic_queue_irq_unlock(vcpu->kvm, irq, flags);