From 0eec832603d3a4ba9ae69a16351cf29c37f7fb7c Mon Sep 17 00:00:00 2001
From: Taiyu Len <taiyu.len@gmail.com>
Date: Fri, 3 May 2019 23:59:28 -0700
Subject: [PATCH] WRITEFUNCTION: add missing set_in_callback around callback

Closes #3837
---
 lib/sendf.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/sendf.c b/lib/sendf.c
index 504a28ae4..5913ea406 100644
--- a/lib/sendf.c
+++ b/lib/sendf.c
@@ -595,7 +595,10 @@ static CURLcode chop_write(struct connectdata *conn,
     size_t chunklen = len <= CURL_MAX_WRITE_SIZE? len: CURL_MAX_WRITE_SIZE;
 
     if(writebody) {
-      size_t wrote = writebody(ptr, 1, chunklen, data->set.out);
+      size_t wrote;
+      Curl_set_in_callback(data, true);
+      wrote = writebody(ptr, 1, chunklen, data->set.out);
+      Curl_set_in_callback(data, false);
 
       if(CURL_WRITEFUNC_PAUSE == wrote) {
         if(conn->handler->flags & PROTOPT_NONETWORK) {