LoongArch: KVM: Check the return values for put_user()

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

Cc: stable@vger.kernel.org
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Qiang Ma <maqianga@uniontech.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 33aefd90d2289d0386ce37123ff373bf6fb23a87..20c207d80e31ae4b398a55fe6c99ddc84593b15a 100644 (file)
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -1106,7 +1106,8 @@ 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;
 }