tls: don't copy the key out of tls12_crypto_info_aes_gcm_128

There's no need to copy the key to an on-stack buffer before calling
crypto_aead_setkey().

Fixes: 3c4d7559159b ("tls: kernel TLS support")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/tls/tls_sw.c b/net/tls/tls_sw.c
index e28a6ff..f29b7c4 100644 (file)
--- a/net/tls/tls_sw.c
+++ b/net/tls/tls_sw.c
@@ -1136,7 +1136,6 @@ void tls_sw_free_resources_rx(struct sock *sk)
 
 int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
 {
-       char keyval[TLS_CIPHER_AES_GCM_128_KEY_SIZE];
        struct tls_crypto_info *crypto_info;
        struct tls12_crypto_info_aes_gcm_128 *gcm_128_info;
        struct tls_sw_context_tx *sw_ctx_tx = NULL;
@@ -1265,9 +1264,7 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
 
        ctx->push_pending_record = tls_sw_push_pending_record;
 
-       memcpy(keyval, gcm_128_info->key, TLS_CIPHER_AES_GCM_128_KEY_SIZE);
-
-       rc = crypto_aead_setkey(*aead, keyval,
+       rc = crypto_aead_setkey(*aead, gcm_128_info->key,
                                TLS_CIPHER_AES_GCM_128_KEY_SIZE);
        if (rc)
                goto free_aead;