diff -up openssl-1.0.1e/crypto/cms/cms_smime.c.unknown-hash openssl-1.0.1e/crypto/cms/cms_smime.c

--- openssl-1.0.1e/crypto/cms/cms_smime.c.unknown-hash	2013-02-11 16:26:04.000000000 +0100

+++ openssl-1.0.1e/crypto/cms/cms_smime.c	2015-06-09 16:07:16.001516190 +0200

@@ -141,7 +141,7 @@ static void do_free_upto(BIO *f, BIO *up

 			BIO_free(f);

 			f = tbio;

 			}

-		while (f != upto);

+		while (f && f != upto);

 		}

 	else

 		BIO_free_all(f);