cifs: free ntlmsspblob allocated in negotiate

One of my previous fixes:
cifs: send workstation name during ntlmssp session setup
...changed the prototype of build_ntlmssp_negotiate_blob
from being allocated by the caller to being allocated within
the function. The caller needs to free this object too.
While SMB2 version of the caller did it, I forgot to free
for the SMB1 version. Fixing that here.

Fixes: 49bd49f ("cifs: send workstation name during ntlmssp session setup")
Cc: stable@vger.kernel.org # 5.16
Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: sprasad-microsoft

fs/cifs/sess.c

@@ -1413,15 +1413,15 @@ sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
 				     &blob_len, ses, server,
 				     sess_data->nls_cp);
 	if (rc)
-		goto out;
+		goto out_free_ntlmsspblob;
 
 	sess_data->iov[1].iov_len = blob_len;
 	sess_data->iov[1].iov_base = ntlmsspblob;
 	pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
 
 	rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
 	if (rc)
-		goto out;
+		goto out_free_ntlmsspblob;
 
 	rc = sess_sendreceive(sess_data);
 
@@ -1435,14 +1435,14 @@ sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
 		rc = 0;
 
 	if (rc)
-		goto out;
+		goto out_free_ntlmsspblob;
 
 	cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
 
 	if (smb_buf->WordCount != 4) {
 		rc = -EIO;
 		cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
-		goto out;
+		goto out_free_ntlmsspblob;
 	}
 
 	ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
@@ -1456,10 +1456,13 @@ sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
 		cifs_dbg(VFS, "bad security blob length %d\n",
 				blob_len);
 		rc = -EINVAL;
-		goto out;
+		goto out_free_ntlmsspblob;
 	}
 
 	rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
+
+out_free_ntlmsspblob:
+	kfree(ntlmsspblob);
 out:
 	sess_free_buffer(sess_data);