Convert some malloc + memcpys into BUF_memdup.

Slightly tidier.

Change-Id: Ib3cb4dc262c88087bd56b446a6f7a05d1e57ade6
Reviewed-on: https://boringssl-review.googlesource.com/1345
Reviewed-by: Adam Langley <agl@google.com>

ssl/ssl_lib.c

@@ -373,12 +373,11 @@ SSL *SSL_new(SSL_CTX *ctx)
 
 	if (s->ctx->alpn_client_proto_list)
 		{
-		s->alpn_client_proto_list =
-			OPENSSL_malloc(s->ctx->alpn_client_proto_list_len);
+		s->alpn_client_proto_list = BUF_memdup(
+			s->ctx->alpn_client_proto_list,
+			s->ctx->alpn_client_proto_list_len);
 		if (s->alpn_client_proto_list == NULL)
 			goto err;
-		memcpy(s->alpn_client_proto_list, s->ctx->alpn_client_proto_list,
-		       s->ctx->alpn_client_proto_list_len);
 		s->alpn_client_proto_list_len = s->ctx->alpn_client_proto_list_len;
 		}
 
@@ -551,10 +550,9 @@ ssl_cipher_preference_list_dup(
 	ret->ciphers = sk_SSL_CIPHER_dup(cipher_list->ciphers);
 	if (!ret->ciphers)
 		goto err;
-	ret->in_group_flags = OPENSSL_malloc(n);
+	ret->in_group_flags = BUF_memdup(cipher_list->in_group_flags, n);
 	if (!ret->in_group_flags)
 		goto err;
-	memcpy(ret->in_group_flags, cipher_list->in_group_flags, n);
 	return ret;
 
 err:
@@ -1802,10 +1800,9 @@ int SSL_CTX_set_alpn_protos(SSL_CTX *ctx, const unsigned char* protos,
 	if (ctx->alpn_client_proto_list)
 		OPENSSL_free(ctx->alpn_client_proto_list);
 
-	ctx->alpn_client_proto_list = OPENSSL_malloc(protos_len);
+	ctx->alpn_client_proto_list = BUF_memdup(protos, protos_len);
 	if (!ctx->alpn_client_proto_list)
 		return 1;
-	memcpy(ctx->alpn_client_proto_list, protos, protos_len);
 	ctx->alpn_client_proto_list_len = protos_len;
 
 	return 0;
@@ -1822,10 +1819,9 @@ int SSL_set_alpn_protos(SSL *ssl, const unsigned char* protos,
 	if (ssl->alpn_client_proto_list)
 		OPENSSL_free(ssl->alpn_client_proto_list);
 
-	ssl->alpn_client_proto_list = OPENSSL_malloc(protos_len);
+	ssl->alpn_client_proto_list = BUF_memdup(protos, protos_len);
 	if (!ssl->alpn_client_proto_list)
 		return 1;
-	memcpy(ssl->alpn_client_proto_list, protos, protos_len);
 	ssl->alpn_client_proto_list_len = protos_len;
 
 	return 0;

ssl/t1_lib.c

@@ -1238,13 +1238,12 @@ unsigned char *ssl_add_clienthello_tlsext(SSL *s, unsigned char *buf, unsigned c
 		else if (s->session && s->tlsext_session_ticket &&
 			 s->tlsext_session_ticket->data)
 			{
-			ticklen = s->tlsext_session_ticket->length;
-			s->session->tlsext_tick = OPENSSL_malloc(ticklen);
+			s->session->tlsext_tick = BUF_memdup(
+			       s->tlsext_session_ticket->data,
+			       s->tlsext_session_ticket->length);
 			if (!s->session->tlsext_tick)
 				return NULL;
-			memcpy(s->session->tlsext_tick,
-			       s->tlsext_session_ticket->data,
-			       ticklen);
+			ticklen = s->tlsext_session_ticket->length;
 			s->session->tlsext_ticklen = ticklen;
 			}
 		else
@@ -1687,13 +1686,12 @@ static int tls1_alpn_handle_client_hello(SSL *s, CBS *cbs, int *out_alert)
 	if (r == SSL_TLSEXT_ERR_OK) {
 		if (s->s3->alpn_selected)
 			OPENSSL_free(s->s3->alpn_selected);
-		s->s3->alpn_selected = OPENSSL_malloc(selected_len);
+		s->s3->alpn_selected = BUF_memdup(selected, selected_len);
 		if (!s->s3->alpn_selected)
 			{
 			*out_alert = SSL_AD_INTERNAL_ERROR;
 			return 0;
 			}
-		memcpy(s->s3->alpn_selected, selected, selected_len);
 		s->s3->alpn_selected_len = selected_len;
 	}
 	return 1;