From af5ef98d1b2221ee4da389bb88dfe1c991d42e8d Mon Sep 17 00:00:00 2001
From: Mike Perry <mikeperry-git@torproject.org>
Date: Tue, 2 Aug 2022 17:33:55 +0000
Subject: [PATCH] Changes file for bug 40644.

---
 changes/bug40644 | 8 ++++++++
 1 file changed, 8 insertions(+)
 create mode 100644 changes/bug40644

diff --git a/changes/bug40644 b/changes/bug40644
new file mode 100644
index 0000000000..a27c63ede2
--- /dev/null
+++ b/changes/bug40644
@@ -0,0 +1,8 @@
+  o Minor bugfixes (congestion control):
+    - Add a check for an integer underflow condition that might
+      happen in cases where the system clock is stopped, the
+      ORconn is blocked, and the endpoint sends more than a
+      congestion window worth of non-data control cells at once.
+      This would cause a large congestion window to be calculated
+      instead of a small one. No security impact. Fixes bug 40644;
+      bugfix on 0.4.7.5-alpha.