diff -up openssl-1.0.1k/crypto/pkcs7/pk7_doit.c.pkcs7-null-deref openssl-1.0.1k/crypto/pkcs7/pk7_doit.c
--- openssl-1.0.1k/crypto/pkcs7/pk7_doit.c.pkcs7-null-deref	2015-01-08 15:00:36.000000000 +0100
+++ openssl-1.0.1k/crypto/pkcs7/pk7_doit.c	2015-03-19 17:30:36.797650980 +0100
@@ -272,6 +272,27 @@ BIO *PKCS7_dataInit(PKCS7 *p7, BIO *bio)
 	PKCS7_RECIP_INFO *ri=NULL;
 	ASN1_OCTET_STRING *os=NULL;
 
+	if (p7 == NULL)
+		{
+		PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_INVALID_NULL_POINTER);
+		return NULL;
+		}
+	/*
+	 * The content field in the PKCS7 ContentInfo is optional, but that really
+	 * only applies to inner content (precisely, detached signatures).
+	 *
+	 * When reading content, missing outer content is therefore treated as an
+	 * error.
+	 *
+	 * When creating content, PKCS7_content_new() must be called before
+	 * calling this method, so a NULL p7->d is always an error.
+	 */
+	if (p7->d.ptr == NULL)
+		{
+		PKCS7err(PKCS7_F_PKCS7_DATAINIT, PKCS7_R_NO_CONTENT);
+		return NULL;
+		}
+
 	i=OBJ_obj2nid(p7->type);
 	p7->state=PKCS7_S_HEADER;
 
@@ -433,6 +454,18 @@ BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKE
        unsigned char *ek = NULL, *tkey = NULL;
        int eklen = 0, tkeylen = 0;
 
+	if (p7 == NULL)
+		{
+		PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_INVALID_NULL_POINTER);
+		return NULL;
+		}
+
+	if (p7->d.ptr == NULL)
+		{
+		PKCS7err(PKCS7_F_PKCS7_DATADECODE, PKCS7_R_NO_CONTENT);
+		return NULL;
+		}
+
 	i=OBJ_obj2nid(p7->type);
 	p7->state=PKCS7_S_HEADER;
 
@@ -752,6 +785,18 @@ int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 	STACK_OF(PKCS7_SIGNER_INFO) *si_sk=NULL;
 	ASN1_OCTET_STRING *os=NULL;
 
+	if (p7 == NULL)
+		{
+		PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_INVALID_NULL_POINTER);
+		return 0;
+		}
+
+	if (p7->d.ptr == NULL)
+		{
+		PKCS7err(PKCS7_F_PKCS7_DATAFINAL, PKCS7_R_NO_CONTENT);
+		return 0;
+		}
+
 	EVP_MD_CTX_init(&ctx_tmp);
 	i=OBJ_obj2nid(p7->type);
 	p7->state=PKCS7_S_HEADER;
@@ -796,6 +841,7 @@ int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 		/* If detached data then the content is excluded */
 		if(PKCS7_type_is_data(p7->d.sign->contents) && p7->detached) {
 			M_ASN1_OCTET_STRING_free(os);
+			os = NULL;
 			p7->d.sign->contents->d.data = NULL;
 		}
 		break;
@@ -806,6 +852,7 @@ int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 		if(PKCS7_type_is_data(p7->d.digest->contents) && p7->detached)
 			{
 			M_ASN1_OCTET_STRING_free(os);
+			os = NULL;
 			p7->d.digest->contents->d.data = NULL;
 			}
 		break;
@@ -878,23 +925,32 @@ int PKCS7_dataFinal(PKCS7 *p7, BIO *bio)
 		M_ASN1_OCTET_STRING_set(p7->d.digest->digest, md_data, md_len);
 		}
 
-	if (!PKCS7_is_detached(p7) && !(os->flags & ASN1_STRING_FLAG_NDEF))
+	if (!PKCS7_is_detached(p7))
 		{
-		char *cont;
-		long contlen;
-		btmp=BIO_find_type(bio,BIO_TYPE_MEM);
-		if (btmp == NULL)
-			{
-			PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
+		/*
+		 * NOTE(emilia): I think we only reach os == NULL here because detached
+		 * digested data support is broken.
+		 */
+		if (os == NULL)
 			goto err;
+		if (!(os->flags & ASN1_STRING_FLAG_NDEF))
+			{
+			char *cont;
+			long contlen;
+			btmp=BIO_find_type(bio,BIO_TYPE_MEM);
+			if (btmp == NULL)
+				{
+				PKCS7err(PKCS7_F_PKCS7_DATAFINAL,PKCS7_R_UNABLE_TO_FIND_MEM_BIO);
+				goto err;
+				}
+			contlen = BIO_get_mem_data(btmp, &cont);
+			/* Mark the BIO read only then we can use its copy of the data
+			 * instead of making an extra copy.
+			 */
+			BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
+			BIO_set_mem_eof_return(btmp, 0);
+			ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
 			}
-		contlen = BIO_get_mem_data(btmp, &cont);
-		/* Mark the BIO read only then we can use its copy of the data
-		 * instead of making an extra copy.
-		 */
-		BIO_set_flags(btmp, BIO_FLAGS_MEM_RDONLY);
-		BIO_set_mem_eof_return(btmp, 0);
-		ASN1_STRING_set0(os, (unsigned char *)cont, contlen);
 		}
 	ret=1;
 err:
@@ -971,6 +1027,18 @@ int PKCS7_dataVerify(X509_STORE *cert_st
 	STACK_OF(X509) *cert;
 	X509 *x509;
 
+	if (p7 == NULL)
+		{
+		PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_INVALID_NULL_POINTER);
+		return 0;
+		}
+
+	if (p7->d.ptr == NULL)
+		{
+		PKCS7err(PKCS7_F_PKCS7_DATAVERIFY, PKCS7_R_NO_CONTENT);
+		return 0;
+		}
+
 	if (PKCS7_type_is_signed(p7))
 		{
 		cert=p7->d.sign->cert;
diff -up openssl-1.0.1k/crypto/pkcs7/pk7_lib.c.pkcs7-null-deref openssl-1.0.1k/crypto/pkcs7/pk7_lib.c
--- openssl-1.0.1k/crypto/pkcs7/pk7_lib.c.pkcs7-null-deref	2014-10-15 15:49:15.000000000 +0200
+++ openssl-1.0.1k/crypto/pkcs7/pk7_lib.c	2015-03-19 17:30:36.797650980 +0100
@@ -459,6 +459,8 @@ int PKCS7_set_digest(PKCS7 *p7, const EV
 
 STACK_OF(PKCS7_SIGNER_INFO) *PKCS7_get_signer_info(PKCS7 *p7)
 	{
+	if (p7 == NULL || p7->d.ptr == NULL)
+		return NULL;
 	if (PKCS7_type_is_signed(p7))
 		{
 		return(p7->d.sign->signer_info);