linux-kernel - [PATCH 4.19 164/170] KVM: arm/arm64: vgic: Cap SPIs to the VM-defined maximum

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Date:   Mon,  7 Jan 2019 13:33:11 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Marc Zyngier <marc.zyngier@....com>
Subject: [PATCH 4.19 164/170] KVM: arm/arm64: vgic: Cap SPIs to the VM-defined maximum

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

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

From: Marc Zyngier <marc.zyngier@....com>

commit bea2ef803ade3359026d5d357348842bca9edcf1 upstream.

SPIs should be checked against the VMs specific configuration, and
not the architectural maximum.

Cc: stable@...r.kernel.org
Signed-off-by: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 virt/kvm/arm/vgic/vgic.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -108,8 +108,8 @@ struct vgic_irq *vgic_get_irq(struct kvm
 	}
 
 	/* SPIs */
-	if (intid <= VGIC_MAX_SPI) {
-		intid = array_index_nospec(intid, VGIC_MAX_SPI);
+	if (intid < (kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS)) {
+		intid = array_index_nospec(intid, kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS);
 		return &kvm->arch.vgic.spis[intid - VGIC_NR_PRIVATE_IRQS];
 	}