Add a mutex to guard reference counting for tls_config.

This makes libtls more friendly for multithreaded use - otherwise we can
end up with incorrect refcounts and end up freeing when we should not be
(or not freeing when we should be).

ok beck@

1 files changed, 4 insertions, 1 deletions

diff --git a/src/lib/libtls/tls_internal.h b/src/lib/libtls/tls_internal.h
index e1a858d4de..3842439d58 100644
--- a/src/lib/libtls/tls_internal.h
+++ b/src/lib/libtls/tls_internal.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: tls_internal.h,v 1.73 2018/11/06 20:34:54 jsing Exp $ */
+/* $OpenBSD: tls_internal.h,v 1.74 2019/04/01 15:58:02 jsing Exp $ */
 /*
  * Copyright (c) 2014 Jeremie Courreges-Anglas <jca@openbsd.org>
  * Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
@@ -19,6 +19,8 @@
 #ifndef HEADER_TLS_INTERNAL_H
 #define HEADER_TLS_INTERNAL_H
 
+#include <pthread.h>
+
 #include <arpa/inet.h>
 #include <netinet/in.h>
 
@@ -75,6 +77,7 @@ struct tls_ticket_key {
 struct tls_config {
         struct tls_error error;
 
+        pthread_mutex_t mutex;
         int refcount;
 
         char *alpn;