From 28055e28973785d867595d81e40c175843186751 Mon Sep 17 00:00:00 2001
From: Pierre Ossman <ossman@cendio.se>
Date: Thu, 23 Feb 2017 13:12:54 +0100
Subject: [PATCH] Don't try to render cursors with no size

Even if there are no pixels it will still trigger sanity checks
when we start throwing bogus coordinates around.
---
 common/rfb/Cursor.cxx | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/common/rfb/Cursor.cxx b/common/rfb/Cursor.cxx
index ffbe955c..99df82d6 100644
--- a/common/rfb/Cursor.cxx
+++ b/common/rfb/Cursor.cxx
@@ -283,6 +283,11 @@ void RenderedCursor::update(PixelBuffer* framebuffer,
   buffer.setPF(format);
   buffer.setSize(clippedRect.width(), clippedRect.height());
 
+  // Bail out early to avoid pestering the framebuffer with
+  // bogus coordinates
+  if (clippedRect.area() == 0)
+    return;
+
   data = framebuffer->getBuffer(buffer.getRect(offset), &stride);
   buffer.imageRect(buffer.getRect(), data, stride);
 
-- 
2.39.5