Commit 36ae3c0a authored Sep 07, 2017 by Jan H. Schönherr Committed by Paolo Bonzini Sep 15, 2017

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: Jan H. Schönherr <jschoenh@amazon.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent 51aa68e7

virt/kvm/eventfd.c

+2 −0

Original line number	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))
		return -EINVAL;
		if (args->gsi >= KVM_MAX_IRQ_ROUTES)
		return -EINVAL;

		if (args->flags & KVM_IRQFD_FLAG_DEASSIGN)
		return kvm_irqfd_deassign(kvm, args);

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