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

[Greg Kroah-Hartman]

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

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

From: Marc Zyngier <marc.zyng...@arm.com>

commit bea2ef803ade3359026d5d357348842bca9edcf1 upstream.

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

Cc: sta...@vger.kernel.org
Signed-off-by: Marc Zyngier <marc.zyng...@arm.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.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];
        }