From cd1c611b24eed0b3eebda52d445b55c6b4a2945f Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Thu, 11 May 2023 09:56:51 +0200
Subject: [PATCH] headers: clear (possibly) lingering pointer in init

The "prevhead" pointer is used for the headers storage but was not
cleared correctly in init, which made it possible to act up when a
handle is reused.

Reported-by: Steve Herrell
Fixes #11101
Closes #11103
---
 lib/headers.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/headers.c b/lib/headers.c
index 6cd7e31703..457ed63eda 100644
--- a/lib/headers.c
+++ b/lib/headers.c
@@ -336,6 +336,7 @@ CURLcode Curl_headers_push(struct Curl_easy *data, const char *header,
 static void headers_init(struct Curl_easy *data)
 {
   Curl_llist_init(&data->state.httphdrs, NULL);
+  data->state.prevhead = NULL;
 }
 
 /*