KVM: s390: return -EFAULT if copy_from_user() fails

When copy_from_user() fails, this code returns the number of bytes
remaining instead of a negative error code.  The positive number is
returned to the user but otherwise it is harmless.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/arch/s390/kvm/guestdbg.c b/arch/s390/kvm/guestdbg.c
index 757ccef62fd5..3e8d4092ce30 100644
--- a/arch/s390/kvm/guestdbg.c
+++ b/arch/s390/kvm/guestdbg.c
@@ -223,9 +223,10 @@ int kvm_s390_import_bp_data(struct kvm_vcpu *vcpu,
                 goto error;
         }
 
-        ret = copy_from_user(bp_data, dbg->arch.hw_bp, size);
-        if (ret)
+        if (copy_from_user(bp_data, dbg->arch.hw_bp, size)) {
+                ret = -EFAULT;
                 goto error;
+        }
 
         for (i = 0; i < dbg->arch.nr_hw_bp; i++) {
                 switch (bp_data[i].type) {