[PATCH v5 1/6] LoongArch: KVM: Check irq validility in kvm_vcpu_ioctl_interrupt()

[Bibo Mao]

Function kvm_vcpu_ioctl_interrupt() can be called from userspace, here
add irq validility cheking in kvm_vcpu_ioctl_interrupt().

Fixes: f45ad5b8aa93 ("LoongArch: KVM: Implement vcpu interrupt operations")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Bibo Mao <maobibo@xxxxxxxxxxx>
---
 arch/loongarch/kvm/vcpu.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index e28084c49e68..df5be9b265e8 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -1487,6 +1487,11 @@ void kvm_lose_fpu(struct kvm_vcpu *vcpu)
 int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
 {
 	int intr = (int)irq->irq;
+	unsigned int vector;
+
+	vector = abs(intr);
+	if (vector >= EXCCODE_INT_NUM)
+		return -EINVAL;
 
 	if (intr > 0)
 		kvm_queue_irq(vcpu, intr);
-- 
2.39.3