[PATCH v3 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 | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index e28084c49e68..673977a25138 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -1486,7 +1486,14 @@ 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;
+	int vector, intr = (int)irq->irq;
+
+	vector = intr;
+	if (intr < 0)
+		vector = -intr;
+
+	if (vector >= EXCCODE_INT_NUM)
+		return -EINVAL;
 
 	if (intr > 0)
 		kvm_queue_irq(vcpu, intr);
-- 
2.39.3