From 673c07a75ed844d74676f3ccdcfdc706a7052dba Mon Sep 17 00:00:00 2001
From: Christian Beier <dontmind@freeshell.org>
Date: Sun, 17 May 2020 13:47:21 +0200
Subject: [PATCH] libvncserver/rfbserver: fix possible divide-by-zero

Closes #409
---
 libvncserver/rfbserver.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libvncserver/rfbserver.c b/libvncserver/rfbserver.c
index 269a0137..9cc29c52 100644
--- a/libvncserver/rfbserver.c
+++ b/libvncserver/rfbserver.c
@@ -3369,6 +3369,9 @@ rfbSendRectEncodingRaw(rfbClientPtr cl,
     char *fbptr = (cl->scaledScreen->frameBuffer + (cl->scaledScreen->paddedWidthInBytes * y)
                    + (x * (cl->scaledScreen->bitsPerPixel / 8)));
 
+    if(!h || !w)
+	return TRUE; /* nothing to send */
+
     /* Flush the buffer to guarantee correct alignment for translateFn(). */
     if (cl->ublen > 0) {
         if (!rfbSendUpdateBuf(cl))