Let SSL_CTX_get_ciphers(NULL) return NULL rather than crash

for compatibility with OpenSSL
and for consistency with neighbouring functions;
suggested by jsing@ after i documented the crash;
OK jsing@.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/lib/libssl/ssl_lib.c b/src/lib/libssl/ssl_lib.c
index 828aa3a08d..73bc05e967 100644
--- a/src/lib/libssl/ssl_lib.c
+++ b/src/lib/libssl/ssl_lib.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: ssl_lib.c,v 1.228 2020/09/15 11:47:49 jsing Exp $ */
+/* $OpenBSD: ssl_lib.c,v 1.229 2020/09/16 07:25:15 schwarze Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -1336,6 +1336,8 @@ SSL_get_cipher_list(const SSL *s, int n)
 STACK_OF(SSL_CIPHER) *
 SSL_CTX_get_ciphers(const SSL_CTX *ctx)
 {
+        if (ctx == NULL)
+                return NULL;
         return ctx->cipher_list;
 }