From 2c54544b48de2998eb657c89bce74d28751adec9 Mon Sep 17 00:00:00 2001
From: Dmitry Belyavskiy <beldmit@gmail.com>
Date: Sun, 6 Feb 2022 14:41:15 +0100
Subject: [PATCH] Ensure that CMAC_ACPKM_CTX_copy works with 2 non-NULL
 pointers.

Related: #387
---
 gost_omac_acpkm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gost_omac_acpkm.c b/gost_omac_acpkm.c
index cec683f..507ca53 100644
--- a/gost_omac_acpkm.c
+++ b/gost_omac_acpkm.c
@@ -372,7 +372,7 @@ static int omac_acpkm_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from)
         }
         return 1;
     }
-    if (c_to->cmac_ctx == c_from->cmac_ctx) {
+    if ((c_to->cmac_ctx == c_from->cmac_ctx) || (c_to->cmac_ctx == NULL))  {
         c_to->cmac_ctx = CMAC_ACPKM_CTX_new();
     }
     return CMAC_ACPKM_CTX_copy(c_to->cmac_ctx, c_from->cmac_ctx);
-- 
2.39.5