5.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Oliver Upton <redacted>

commit 8d3a7dfb801d157ac423261d7cd62c33e95375f8 upstream.

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: 33d3bc9556a7 ("KVM: arm64: vgic-its: Read initial LPI pending table")
Signed-off-by: Oliver Upton <redacted>
Link: https://lore.kernel.org/r/20240221092732.4126848-2-oliver.upton@linux.dev (local)
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/arm64/kvm/vgic/vgic-its.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/arch/arm64/kvm/vgic/vgic-its.c
+++ b/arch/arm64/kvm/vgic/vgic-its.c

@@ -462,6 +462,9 @@ static int its_sync_lpi_pending_table(st
 		}
 
 		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);