From: Vitaly Chikunov <vt@altlinux.org>
Date: Sat, 11 Aug 2018 04:57:38 +0000 (+0300)
Subject: Allow double calling of gost_grasshopper_cipher_cleanup()
X-Git-Tag: v3.0.0~361^2
X-Git-Url: http://wagner.pp.ru/gitweb/?a=commitdiff_plain;h=refs%2Fpull%2F82%2Fhead;p=openssl-gost%2Fengine.git

Allow double calling of gost_grasshopper_cipher_cleanup()
---

diff --git a/gost_grasshopper_cipher.c b/gost_grasshopper_cipher.c
index e78fae7..a482a39 100644
--- a/gost_grasshopper_cipher.c
+++ b/gost_grasshopper_cipher.c
@@ -604,6 +604,10 @@ int gost_grasshopper_cipher_do_cfb(EVP_CIPHER_CTX* ctx, unsigned char* out,
 
 int gost_grasshopper_cipher_cleanup(EVP_CIPHER_CTX* ctx) {
     gost_grasshopper_cipher_ctx* c = (gost_grasshopper_cipher_ctx*) EVP_CIPHER_CTX_get_cipher_data(ctx);
+
+    if (!c)
+        return 1;
+
     struct GRASSHOPPER_CIPHER_PARAMS* params = &gost_cipher_params[c->type];
 
     gost_grasshopper_cipher_destroy(c);