From 36ae3c0a36b7456432fedce38ae2f7bd3e01a563 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20H=2E=20Sch=C3=B6nherr?= <jschoenh@amazon.de>
Date: Thu, 7 Sep 2017 19:02:48 +0100
Subject: [PATCH] KVM: Don't accept obviously wrong gsi values via KVM_IRQFD
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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>
---
virt/kvm/eventfd.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index f2ac53ab82438..c608ab495282d 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);
--
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