[PATCH] LoongArch: KVM: Check return values for put_user

[Qiang Ma]

put_user() may return -EFAULT, so, when the user space address
is invalid, it should return -EFAULT.

Signed-off-by: Qiang Ma <maqianga@xxxxxxxxxxxxx>
---
 arch/loongarch/kvm/vcpu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 782dc1a36e29..67441edf0e1f 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -1104,7 +1104,8 @@ static int kvm_loongarch_cpucfg_get_attr(struct kvm_vcpu *vcpu,
 		return -ENXIO;
 	}
 
-	put_user(val, uaddr);
+	if (put_user(val, uaddr))
+		return -EFAULT;
 
 	return ret;
 }
-- 
2.20.1