From: Dmitry Belyavskiy <beldmit@gmail.com>
Date: Sun, 6 Feb 2022 13:41:15 +0000 (+0100)
Subject: Ensure that CMAC_ACPKM_CTX_copy works with 2 non-NULL pointers.
X-Git-Tag: v3.0.1~7
X-Git-Url: http://www.wagner.pp.ru/gitweb/?p=openssl-gost%2Fengine.git;a=commitdiff_plain;h=2c54544b48de2998eb657c89bce74d28751adec9

Ensure that CMAC_ACPKM_CTX_copy works with 2 non-NULL pointers.

Related: #387
---

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);