From 81c3a87ee5018104b76afe4c9d6c2b848f0acdaf Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Fri, 17 Nov 2017 23:38:39 -0800
Subject: [PATCH] ircd::buffer: Fix bug.

---
 include/ircd/buffer.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/ircd/buffer.h b/include/ircd/buffer.h
index 9cf8d2a13..7ebc47456 100644
--- a/include/ircd/buffer.h
+++ b/include/ircd/buffer.h
@@ -572,8 +572,9 @@ ircd::buffer::copy(it &dest,
 {
 	const it ret{dest};
 	const size_t remain(stop - dest);
-	dest += std::min(size(src), remain);
-	memcpy(ret, data(src), dest - ret);
+	const size_t cpsz{std::min(size(src), remain)};
+	memcpy(ret, data(src), cpsz);
+	dest += cpsz;
 	return ret;
 }