From 27af6fefe662b36827f70cf1a041ac350c8b39b2 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 8 Mar 2021 11:28:41 +0100
Subject: quiche: fix crash when failing to connect
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Reported-by: ウさん
Fixes #6664
---
 lib/connect.c      | 4 +++-
 lib/vquic/quiche.c | 2 ++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/connect.c b/lib/connect.c
index 6c9464360..f9dd415ba 100644
--- a/lib/connect.c
+++ b/lib/connect.c
@@ -908,8 +908,10 @@ CURLcode Curl_is_connected(struct Curl_easy *data,
         connkeep(conn, "HTTP/3 default");
         return CURLE_OK;
       }
-      if(result)
+      if(result) {
+        conn->tempsock[i] = CURL_SOCKET_BAD;
         error = SOCKERRNO;
+      }
     }
     else
 #endif
diff --git a/lib/vquic/quiche.c b/lib/vquic/quiche.c
index 9b476cbd2..a3870749b 100644
--- a/lib/vquic/quiche.c
+++ b/lib/vquic/quiche.c
@@ -360,6 +360,8 @@ static CURLcode process_ingress(struct Curl_easy *data, int sockfd,
   uint8_t *buf = (uint8_t *)data->state.buffer;
   size_t bufsize = data->set.buffer_size;
 
+  DEBUGASSERT(qs->conn);
+
   /* in case the timeout expired */
   quiche_conn_on_timeout(qs->conn);
 
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