From 058f98dc3fe595f21dc26a5b9b1699e519ba5705 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <[email protected]>
Date: Mon, 25 Apr 2022 11:48:00 +0200
Subject: [PATCH] conncache: include the zone id in the "bundle" hashkey

Make connections to two separate IPv6 zone ids create separate
connections.

Reported-by: Harry Sintonen
Bug: https://curl.se/docs/CVE-2022-27775.html
Closes #8747
---
 lib/conncache.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/conncache.c b/lib/conncache.c
index ec669b971dc3..8948b53fa500 100644
--- a/lib/conncache.c
+++ b/lib/conncache.c
@@ -155,8 +155,12 @@ static void hashkey(struct connectdata *conn, char *buf,
     /* report back which name we used */
     *hostp = hostname;
 
-  /* put the number first so that the hostname gets cut off if too long */
-  msnprintf(buf, len, "%ld%s", port, hostname);
+  /* put the numbers first so that the hostname gets cut off if too long */
+#ifdef ENABLE_IPV6
+  msnprintf(buf, len, "%u/%ld/%s", conn->scope_id, port, hostname);
+#else
+  msnprintf(buf, len, "%ld/%s", port, hostname);
+#endif
   Curl_strntolower(buf, buf, len);
 }