From 2bf77b3cbaa15b05f0b946ab6fb0976d0ec29001 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 18 Jan 2021 08:55:13 +0100
Subject: send: assert that Curl_write_plain() has a ->conn when called

To help catch bad invokes.

Closes #6476
---
 lib/sendf.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/sendf.c b/lib/sendf.c
index e756f1ca1..5075c5439 100644
--- a/lib/sendf.c
+++ b/lib/sendf.c
@@ -406,7 +406,9 @@ CURLcode Curl_write_plain(struct Curl_easy *data,
 {
   CURLcode result;
   struct connectdata *conn = data->conn;
-  int num = (sockfd == conn->sock[SECONDARYSOCKET]);
+  int num;
+  DEBUGASSERT(conn);
+  num = (sockfd == conn->sock[SECONDARYSOCKET]);
 
   *written = Curl_send_plain(data, num, mem, len, &result);
 
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