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-rw-r--r--lib/vtls/schannel.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/lib/vtls/schannel.c b/lib/vtls/schannel.c
index 56fd93e1e..ab7f83f46 100644
--- a/lib/vtls/schannel.c
+++ b/lib/vtls/schannel.c
@@ -7,7 +7,7 @@
*
* Copyright (C) 2012 - 2016, Marc Hoersken, <info@marc-hoersken.de>
* Copyright (C) 2012, Mark Salisbury, <mark.salisbury@hp.com>
- * Copyright (C) 2012 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 2012 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@@ -2013,9 +2013,16 @@ static int Curl_schannel_shutdown(struct connectdata *conn, int sockindex)
/* free SSPI Schannel API credential handle */
if(BACKEND->cred) {
- Curl_ssl_sessionid_lock(conn);
+ /*
+ * When this function is called from Curl_schannel_close() the connection
+ * might not have an associated transfer so the check for conn->data is
+ * necessary.
+ */
+ if(conn->data)
+ Curl_ssl_sessionid_lock(conn);
Curl_schannel_session_free(BACKEND->cred);
- Curl_ssl_sessionid_unlock(conn);
+ if(conn->data)
+ Curl_ssl_sessionid_unlock(conn);
BACKEND->cred = NULL;
}