Set alpn_selected_len to zero when freeing alpn_selected.

This is not strictly necessary since we proceed to zero the entire struct,
however it keeps the code consistent and easily auditable.

ok tb@

diff --git a/lib/libssl/s3_lib.c b/lib/libssl/s3_lib.c
index 9df06c5..6563de5 100644 (file)
--- a/lib/libssl/s3_lib.c
+++ b/lib/libssl/s3_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: s3_lib.c,v 1.206 2021/03/24 18:43:59 jsing Exp $ */
+/* $OpenBSD: s3_lib.c,v 1.207 2021/04/19 16:47:25 jsing Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -1627,6 +1627,7 @@ ssl3_clear(SSL *s)
 
        free(S3I(s)->alpn_selected);
        S3I(s)->alpn_selected = NULL;
+       S3I(s)->alpn_selected_len = 0;
 
        memset(S3I(s), 0, sizeof(*S3I(s)));
        internal = S3I(s);