KVM: Fix off-by-one in overflow check of KVM_ASSIGN_SET_MSIX_NR

KVM_MAX_MSIX_PER_DEV implies that up to that many MSI-X entries can be
requested. But the kernel so far rejected already the upper limit.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c
index 6cc4b97ec458..4e9eaeb518c7 100644
--- a/virt/kvm/assigned-dev.c
+++ b/virt/kvm/assigned-dev.c
@@ -617,7 +617,7 @@ static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
         if (adev->entries_nr == 0) {
                 adev->entries_nr = entry_nr->entry_nr;
                 if (adev->entries_nr == 0 ||
-                    adev->entries_nr >= KVM_MAX_MSIX_PER_DEV) {
+                    adev->entries_nr > KVM_MAX_MSIX_PER_DEV) {
                         r = -EINVAL;
                         goto msix_nr_out;
                 }