From: Jan Kiszka <jan.kiszka@siemens.com>
Date: Sat, 11 Jun 2011 10:23:55 +0000 (+0200)
Subject: KVM: Fix off-by-one in overflow check of KVM_ASSIGN_SET_MSIX_NR
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9f3191aec595ef9f3c80bc96664fd7aef57ef5be;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

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>
---

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;
 		}