mbedtls/ssl: free cert chain when mbedtls_client_preload_filepath enabled

Signed-off-by: makejian <makejian@xiaomi.com>

Author: ThePassionate

lib/tls/mbedtls/wrapper/library/ssl_lib.c

@@ -231,9 +231,11 @@ SSL_CTX* SSL_CTX_new(const SSL_METHOD *method, void *rngctx)
 	*px = malloc(sizeof(**px));
 	mbedtls_x509_crt_init(*px);
 	n = mbedtls_x509_crt_parse_file(*px, mbedtls_client_preload_filepath);
-	if (n < 0)
+	if (n < 0) {
 		lwsl_err("%s: unable to load cert bundle 0x%x\n", __func__, -n);
-	else
+		mbedtls_x509_crt_free(*px);
+		free(*px);
+	} else
 		lwsl_info("%s: loaded cert bundle %d\n", __func__, n);
     }
 #endif
@@ -257,6 +259,17 @@ void SSL_CTX_free(SSL_CTX* ctx)
 
     ssl_cert_free(ctx->cert);
 
+#if defined(LWS_HAVE_mbedtls_x509_crt_parse_file)
+    if (mbedtls_client_preload_filepath) {
+        mbedtls_x509_crt **px = (mbedtls_x509_crt **)ctx->client_CA->x509_pm;
+
+        if (*px) {
+            mbedtls_x509_crt_free(*px);
+            free(*px);
+        }
+    }
+#endif
+
     X509_free(ctx->client_CA);
 
     if (ctx->alpn_protos) {