Fixed NULL pointer dereference in PKCS7_dataDecode reported by David Ramos in PR#3339

crypto/pkcs7/pk7_doit.c

@@ -440,6 +440,11 @@ BIO *PKCS7_dataDecode(PKCS7 *p7, EVP_PKEY *pkey, BIO *in_bio, X509 *pcert)
 		{
 	case NID_pkcs7_signed:
 		data_body=PKCS7_get_octet_string(p7->d.sign->contents);
+		if (!PKCS7_is_detached(p7) && data_body == NULL)
+			{
+			PKCS7err(PKCS7_F_PKCS7_DATADECODE,PKCS7_R_INVALID_SIGNED_DATA_TYPE);
+			goto err;
+			}
 		md_sk=p7->d.sign->md_algs;
 		break;
 	case NID_pkcs7_signedAndEnveloped:

crypto/pkcs7/pkcs7.h

@@ -456,6 +456,7 @@ void ERR_load_PKCS7_strings(void);
 #define PKCS7_R_ERROR_SETTING_CIPHER			 121
 #define PKCS7_R_INVALID_MIME_TYPE			 131
 #define PKCS7_R_INVALID_NULL_POINTER			 143
+#define PKCS7_R_INVALID_SIGNED_DATA_TYPE		 155
 #define PKCS7_R_MIME_NO_CONTENT_TYPE			 132
 #define PKCS7_R_MIME_PARSE_ERROR			 133
 #define PKCS7_R_MIME_SIG_PARSE_ERROR			 134

crypto/pkcs7/pkcs7err.c

 /* crypto/pkcs7/pkcs7err.c */
 /* ====================================================================
- * Copyright (c) 1999-2007 The OpenSSL Project.  All rights reserved.
+ * Copyright (c) 1999-2014 The OpenSSL Project.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -130,6 +130,7 @@ static ERR_STRING_DATA PKCS7_str_reasons[]=
 {ERR_REASON(PKCS7_R_ERROR_SETTING_CIPHER),"error setting cipher"},
 {ERR_REASON(PKCS7_R_INVALID_MIME_TYPE)   ,"invalid mime type"},
 {ERR_REASON(PKCS7_R_INVALID_NULL_POINTER),"invalid null pointer"},
+{ERR_REASON(PKCS7_R_INVALID_SIGNED_DATA_TYPE),"invalid signed data type"},
 {ERR_REASON(PKCS7_R_MIME_NO_CONTENT_TYPE),"mime no content type"},
 {ERR_REASON(PKCS7_R_MIME_PARSE_ERROR)    ,"mime parse error"},
 {ERR_REASON(PKCS7_R_MIME_SIG_PARSE_ERROR),"mime sig parse error"},