From 36ae3c0a36b7456432fedce38ae2f7bd3e01a563 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Jan=20H=2E=20Sch=C3=B6nherr?= Date: Thu, 7 Sep 2017 19:02:48 +0100 Subject: [PATCH] KVM: Don't accept obviously wrong gsi values via KVM_IRQFD MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Paolo Bonzini --- virt/kvm/eventfd.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c index f2ac53ab8243..c608ab495282 100644 --- a/virt/kvm/eventfd.c +++ b/virt/kvm/eventfd.c @@ -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); -- 2.30.2