KVM: Sanitize KVM_IRQFD flags

We only know of one so far.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index c307c24c147affbc0dfadf65f938c8073f1067fb..7d7e2aaffece234a81cef3f4181cc7ffe5bb14cb 100644 (file)
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -340,6 +340,9 @@ kvm_irqfd_deassign(struct kvm *kvm, struct kvm_irqfd *args)
 int
 kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
 {
+       if (args->flags & ~KVM_IRQFD_FLAG_DEASSIGN)
+               return -EINVAL;
+
        if (args->flags & KVM_IRQFD_FLAG_DEASSIGN)
                return kvm_irqfd_deassign(kvm, args);