Check GOST parameters are not NULL (CVE-2012-0027)

CHANGES

@@ -261,6 +261,9 @@
   *) Add support for SCTP.
      [Robin Seggelmann <seggelmann@fh-muenster.de>]
 
+  *) Check parameters are not NULL in GOST ENGINE. (CVE-2012-0027)
+     [Andrey Kulikov <amdeich@gmail.com>]
+
   *) Prevent malformed RFC3779 data triggering an assertion failure.
      Thanks to Andrew Chi, BBN Technologies, for discovering the flaw
      and Rob Austein <sra@hactrn.net> for fixing it. (CVE-2011-4577)

engines/ccgost/gost2001_keyx.c

@@ -280,6 +280,10 @@ int pkey_GOST01cp_decrypt(EVP_PKEY_CTX *pctx, unsigned char *key, size_t * key_l
 		}
 		
 	param = get_encryption_params(gkt->key_agreement_info->cipher);
+    if(!param){
+        goto err;
+    }
+
 	gost_init(&ctx,param->sblock);	
 	OPENSSL_assert(gkt->key_agreement_info->eph_iv->length==8);
 	memcpy(wrappedKey,gkt->key_agreement_info->eph_iv->data,8);

engines/ccgost/gost94_keyx.c

@@ -261,6 +261,10 @@ int pkey_GOST94cp_decrypt(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *key_len
 		}
 
 	param = get_encryption_params(gkt->key_agreement_info->cipher);
+    if(!param){
+        goto err;
+    }
+	
 	gost_init(&cctx,param->sblock);	
 	OPENSSL_assert(gkt->key_agreement_info->eph_iv->length==8);
 	memcpy(wrappedKey,gkt->key_agreement_info->eph_iv->data,8);