From 7ec3fc7a5ab235c04d1dc09ce514f45bed11cb25 Mon Sep 17 00:00:00 2001
From: Peter Surda <surda@economicsofbitcoin.com>
Date: Thu, 19 Oct 2017 09:00:54 +0200
Subject: [PATCH] Prevent negative DownloadChunk in asyncore

---
 src/network/advanceddispatcher.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/network/advanceddispatcher.py b/src/network/advanceddispatcher.py
index 576eed39..331daf03 100644
--- a/src/network/advanceddispatcher.py
+++ b/src/network/advanceddispatcher.py
@@ -79,6 +79,8 @@ class AdvancedDispatcher(asyncore.dispatcher):
         try:
             if self.expectBytes > 0 and not self.fullyEstablished:
                 self.downloadChunk = min(self.downloadChunk, self.expectBytes - len(self.read_buf))
+                if self.downloadChunk < 0:
+                    self.downloadChunk = 0
         except AttributeError:
             pass
         return asyncore.dispatcher.readable(self) and \