Fix error path in int create_ssl_ctx_pair()

If we hit the error path and create_ssl_ctx_pair has been passed a
pre-created SSL_CTX then we could end up with a double free.

Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/11834)

diff --git a/test/ssltestlib.c b/test/ssltestlib.c
index ce0e77611038a79699639b0ce41ab8919722596e..96c1a7f2de9176ceeaf84d8dd98e5015387a97d8 100644 (file)
--- a/test/ssltestlib.c
+++ b/test/ssltestlib.c
@@ -741,8 +741,10 @@ const SSL_METHOD *cm,
     return 1;
 
  err:
-    SSL_CTX_free(serverctx);
-    SSL_CTX_free(clientctx);
+    if (*sctx == NULL)
+        SSL_CTX_free(serverctx);
+    if (cctx != NULL && *cctx == NULL)
+        SSL_CTX_free(clientctx);
     return 0;
 }