Adapted from https://github.com/LibVNC/libvncserver/commit/c2c4b81e6cb3b485fb1ec7ba9e7defeb889f6ba7
diff --git a/vncviewer/rfbproto.c b/vncviewer/rfbproto.c
index 04b0230..bd11b54 100644
--- a/vncviewer/rfbproto.c
+++ b/vncviewer/rfbproto.c
@@ -303,7 +303,12 @@ InitialiseRFBConnection(void)
   si.format.blueMax = Swap16IfLE(si.format.blueMax);
   si.nameLength = Swap32IfLE(si.nameLength);
 
-  /* FIXME: Check arguments to malloc() calls. */
+  if (si.nameLength > 1<<20) {
+    fprintf(stderr, "Too big desktop name length sent by server: %lu B > 1 MB\n",
+            (unsigned long)si.nameLength);
+    return False;
+  }
+
   desktopName = malloc(si.nameLength + 1);
   if (!desktopName) {
     fprintf(stderr, "Error allocating memory for desktop name, %lu bytes\n",