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Commit 36ae3c0a authored by Jan H. Schönherr's avatar Jan H. Schönherr Committed by Paolo Bonzini
Browse files

KVM: Don't accept obviously wrong gsi values via KVM_IRQFD 



We cannot add routes for gsi values >= KVM_MAX_IRQ_ROUTES -- see
kvm_set_irq_routing(). Hence, there is no sense in accepting them
via KVM_IRQFD. Prevent them from entering the system in the first
place.

Signed-off-by: default avatarJan H. Schönherr <jschoenh@amazon.de>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 51aa68e7

virt/kvm/eventfd.c

+2 −0
Original line number Original line Diff line number Diff line
@@ -565,6 +565,8 @@ kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args) 
{

{

	if (args->flags & ~(KVM_IRQFD_FLAG_DEASSIGN | KVM_IRQFD_FLAG_RESAMPLE))

	if (args->flags & ~(KVM_IRQFD_FLAG_DEASSIGN | KVM_IRQFD_FLAG_RESAMPLE))

		return -EINVAL;

		return -EINVAL;

	if (args->gsi >= KVM_MAX_IRQ_ROUTES)

		return -EINVAL;





	if (args->flags & KVM_IRQFD_FLAG_DEASSIGN)

	if (args->flags & KVM_IRQFD_FLAG_DEASSIGN)

		return kvm_irqfd_deassign(kvm, args);

		return kvm_irqfd_deassign(kvm, args);