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>

1 files changed, 3 insertions, 0 deletions

diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index c307c24c147a..7d7e2aaffece 100644
--- 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);