From: Dmitry Belyavskiy <beldmit@gmail.com>
Date: Mon, 7 Feb 2022 17:31:04 +0000 (+0100)
Subject: Ensure that CMAC_ACPKM_CTX_copy works with 2 non-NULL pointers - fixup
X-Git-Tag: v3.0.1~6
X-Git-Url: http://www.wagner.pp.ru/gitweb/?p=openssl-gost%2Fengine.git;a=commitdiff_plain;h=374627ab520fca0a189d56a747abbff7e2b67bd7

Ensure that CMAC_ACPKM_CTX_copy works with 2 non-NULL pointers - fixup

Related: #387
---

diff --git a/gost_omac_acpkm.c b/gost_omac_acpkm.c
index 507ca53..8e2c4df 100644
--- a/gost_omac_acpkm.c
+++ b/gost_omac_acpkm.c
@@ -98,7 +98,7 @@ static void CMAC_ACPKM_CTX_free(CMAC_ACPKM_CTX *ctx)
     OPENSSL_free(ctx);
 }
 
-int CMAC_ACPKM_CTX_copy(CMAC_ACPKM_CTX *out, const CMAC_ACPKM_CTX *in)
+static int CMAC_ACPKM_CTX_copy(CMAC_ACPKM_CTX *out, const CMAC_ACPKM_CTX *in)
 {
     int bl;
     if (in->nlast_block == -1)
@@ -375,7 +375,8 @@ static int omac_acpkm_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from)
     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);
+
+    return (c_to->cmac_ctx) ? CMAC_ACPKM_CTX_copy(c_to->cmac_ctx, c_from->cmac_ctx) : 0;
 }
 
 /* Clean up imit ctx */