From cf27af00ac4d9a727cbe70c87965cddc7fdd9a8a Mon Sep 17 00:00:00 2001
From: ZacharyZcR <zacharyzcr1984@gmail.com>
Date: Wed, 13 May 2026 16:25:18 +0800
Subject: [PATCH] fix: sanitize dpi value before passing to guacd

---
 src/backend/guacamole/routes.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/backend/guacamole/routes.ts b/src/backend/guacamole/routes.ts
index afbd5d2c..714d088b 100644
--- a/src/backend/guacamole/routes.ts
+++ b/src/backend/guacamole/routes.ts
@@ -192,6 +192,11 @@ router.post(
         }
       }
 
+      if (guacConfig.dpi != null) {
+        const parsed = parseInt(String(guacConfig.dpi), 10);
+        guacConfig.dpi = Number.isFinite(parsed) && parsed > 0 ? parsed : undefined;
+      }
+
       let token: string;
       const hostname = host.ip as string;
       const port = host.port as number;