Initialise some variables

Author: aiden-ct

components/security/mbedtls/src/ssl_cli.c

@@ -342,7 +342,7 @@ static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl,
 
     *olen = 6;
 }
-#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || 
+#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
           MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
 
 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
@@ -1217,7 +1217,7 @@ static int ssl_parse_supported_point_formats_ext( mbedtls_ssl_context *ssl,
         {
 #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
             ssl->handshake->ecdh_ctx.point_format = p[0];
-#endif            
+#endif
 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
             ssl->handshake->ecjpake_ctx.point_format = p[0];
 #endif
@@ -1232,7 +1232,7 @@ static int ssl_parse_supported_point_formats_ext( mbedtls_ssl_context *ssl,
     MBEDTLS_SSL_DEBUG_MSG( 1, ( "no point format in common" ) );
     return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
 }
-#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || 
+#endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
           MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
 
 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
@@ -2339,7 +2339,7 @@ static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl )
         ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
         ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
     {
-        size_t sig_len, hashlen;
+        size_t sig_len, hashlen = 0;
         unsigned char hash[64];
         mbedtls_md_type_t md_alg = MBEDTLS_MD_NONE;
         mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
@@ -2726,7 +2726,7 @@ static int ssl_parse_server_hello_done( mbedtls_ssl_context *ssl )
 static int ssl_write_client_key_exchange( mbedtls_ssl_context *ssl )
 {
     int ret;
-    size_t i, n;
+    size_t i = 0, n = 0;
     const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
 
     MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write client key exchange" ) );

components/security/mbedtls/src/ssl_tls.c

@@ -488,8 +488,8 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
     unsigned char keyblk[256];
     unsigned char *key1;
     unsigned char *key2;
-    unsigned char *mac_enc;
-    unsigned char *mac_dec;
+    unsigned char *mac_enc = NULL;
+    unsigned char *mac_dec = NULL;
     size_t iv_copy_len;
     const mbedtls_cipher_info_t *cipher_info;
     const mbedtls_md_info_t *md_info;
@@ -817,7 +817,7 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
 #if defined(MBEDTLS_SSL_PROTO_SSL3)
     if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
     {
-        if( transform->maclen > sizeof transform->mac_enc )
+        if( (transform->maclen > sizeof transform->mac_enc) || (!mac_enc) || (!mac_dec) )
         {
             MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
             return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
@@ -830,7 +830,7 @@ int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
     defined(MBEDTLS_SSL_PROTO_TLS1_2)
-    if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
+    if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 && mac_enc && mac_dec)
     {
         mbedtls_md_hmac_starts( &transform->md_ctx_enc, mac_enc, transform->maclen );
         mbedtls_md_hmac_starts( &transform->md_ctx_dec, mac_dec, transform->maclen );