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

Dan Carpenter
2017-06-23T10:16:02Z

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.carpenter@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;
}