diff -up openssl-1.0.1e/crypto/rsa/rsa_ameth.c.pss-check openssl-1.0.1e/crypto/rsa/rsa_ameth.c
--- openssl-1.0.1e/crypto/rsa/rsa_ameth.c.pss-check	2013-02-11 16:26:04.000000000 +0100
+++ openssl-1.0.1e/crypto/rsa/rsa_ameth.c	2015-12-04 09:03:18.300660817 +0100
@@ -287,7 +287,7 @@ static RSA_PSS_PARAMS *rsa_pss_decode(co
 		{
 		ASN1_TYPE *param = pss->maskGenAlgorithm->parameter;
 		if (OBJ_obj2nid(pss->maskGenAlgorithm->algorithm) == NID_mgf1
-			&& param->type == V_ASN1_SEQUENCE)
+			&& param && param->type == V_ASN1_SEQUENCE)
 			{
 			p = param->value.sequence->data;
 			plen = param->value.sequence->length;