[PATCH] KVM: ioapic: add check for RTC_GSI

[Chris J Arges]

cppcheck found the following error:
[ioapic.c:114]: (error) Array index -1 is out of bounds.

If CONFIG_X86 is not defined, RTC_GSI == -1U which means that an out of bounds
error could occur when accessing &ioapic->redirtbl[RTC_GSI].

This patch adds a check to kvm_rtc_eoi_tracking_restore_one that is similar to
how kvm_rtc_eoi_tracking_restore_all checks this condition.

Signed-off-by: Chris J Arges <chris.j.arges@xxxxxxxxxxxxx>
---
 virt/kvm/ioapic.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index e8ce34c..859f5b8 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -136,6 +136,9 @@ void kvm_rtc_eoi_tracking_restore_one(struct kvm_vcpu *vcpu)
 {
 	struct kvm_ioapic *ioapic = vcpu->kvm->arch.vioapic;
 
+	if (RTC_GSI >= IOAPIC_NUM_PINS)
+		return;
+
 	spin_lock(&ioapic->lock);
 	__rtc_irq_eoi_tracking_restore_one(vcpu);
 	spin_unlock(&ioapic->lock);
-- 
1.9.1

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