[PATCH -net] tls: return -EFAULT if copy_to_user() fails

[Dan Carpenter]

The copy_to_user() function returns the number of bytes remaining but we
want to return -EFAULT here.

Fixes: 3c4d7559159b ("tls: kernel TLS support")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index 2ebc328bda96..a03130a47b85 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -273,7 +273,8 @@ static int do_tls_getsockopt_tx(struct sock *sk, char 
__user *optval,
        }
 
        if (len == sizeof(crypto_info)) {
-               rc = copy_to_user(optval, crypto_info, sizeof(*crypto_info));
+               if (copy_to_user(optval, crypto_info, sizeof(*crypto_info)))
+                       rc = -EFAULT;
                goto out;
        }
 
@@ -293,9 +294,10 @@ static int do_tls_getsockopt_tx(struct sock *sk, char 
__user *optval,
                memcpy(crypto_info_aes_gcm_128->iv, ctx->iv,
                       TLS_CIPHER_AES_GCM_128_IV_SIZE);
                release_sock(sk);
-               rc = copy_to_user(optval,
-                                 crypto_info_aes_gcm_128,
-                                 sizeof(*crypto_info_aes_gcm_128));
+               if (copy_to_user(optval,
+                                crypto_info_aes_gcm_128,
+                                sizeof(*crypto_info_aes_gcm_128)))
+                       rc = -EFAULT;
                break;
        }
        default: