From c4fbae3ae6166dddfa126734edd63213afa14dce Mon Sep 17 00:00:00 2001
From: Azat Khuzhin <azat@libevent.org>
Date: Sun, 3 Mar 2019 19:03:29 +0300
Subject: [PATCH] buffer: make evbuffer_prepend() of zero-length array no-op

Refs: #774
---
 buffer.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/buffer.c b/buffer.c
index 8e947892..690154bf 100644
--- a/buffer.c
+++ b/buffer.c
@@ -1829,6 +1829,10 @@ evbuffer_prepend(struct evbuffer *buf, const void *data, size_t datlen)
 
 	EVBUFFER_LOCK(buf);
 
+	if (datlen == 0) {
+		result = 0;
+		goto done;
+	}
 	if (buf->freeze_start) {
 		goto done;
 	}
-- 
2.50.1