From bff1462e9ea5e579aa3ffc4817e948b81d32ef96 Mon Sep 17 00:00:00 2001
From: cpq <valenok@gmail.com>
Date: Sun, 28 May 2023 17:06:47 +0100
Subject: [PATCH] Add config var size check

---
 examples/device-dashboard/net.c | 7 ++++++-
 examples/device-dashboard/net.h | 2 ++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/examples/device-dashboard/net.c b/examples/device-dashboard/net.c
index a0aa1bf8..f38b5578 100644
--- a/examples/device-dashboard/net.c
+++ b/examples/device-dashboard/net.c
@@ -188,7 +188,12 @@ static void handle_settings_set(struct mg_connection *c, struct mg_str body) {
   settings.log_level = mg_json_get_long(body, "$.log_level", 0);
   settings.brightness = mg_json_get_long(body, "$.brightness", 0);
   char *s = mg_json_get_str(body, "$.device_name");
-  if (s) free(settings.device_name), settings.device_name = s;
+  if (s && strlen(s) < MAX_DEVICE_NAME) {
+    free(settings.device_name);
+    settings.device_name = s;
+  } else {
+    free(s);
+  }
 
   // Save to the device flash
   s_settings = settings;
diff --git a/examples/device-dashboard/net.h b/examples/device-dashboard/net.h
index 164a8856..6c948a6b 100644
--- a/examples/device-dashboard/net.h
+++ b/examples/device-dashboard/net.h
@@ -12,4 +12,6 @@
 #define HTTPS_URL "http://0.0.0.0:8443"
 #endif
 
+#define MAX_DEVICE_NAME 40
+
 void web_init(struct mg_mgr *mgr);