fs/cifs: correctly to anonymous authentication for the NTLM(v2) authentication

commit 1a967d6c upstream.

Only server which map unknown users to guest will allow
access using a non-null NTLMv2_Response.

For Samba it's the "map to guest = bad user" option.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11913Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
[bwh: Backported to 3.16:adjust context, indentation]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

fs/cifs/sess.c

@@ -703,13 +703,14 @@ CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
 		/* LM2 password would be here if we supported it */
 		pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
 
+		if (ses->user_name != NULL) {
 			/* calculate nlmv2 response and session key */
 			rc = setup_ntlmv2_rsp(ses, nls_cp);
 			if (rc) {
-			cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n",
-				 rc);
+				cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
 				goto ssetup_exit;
 			}
+
 			memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
 					ses->auth_key.len - CIFS_SESS_KEY_SIZE);
 			bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
@@ -719,6 +720,9 @@ CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
 			 */
 			pSMB->req_no_secext.CaseSensitivePasswordLength =
 				cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
+		} else {
+			pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
+		}
 
 		if (ses->capabilities & CAP_UNICODE) {
 			if (iov[0].iov_len % 2) {