[CIFS] Possible null ptr deref in SMB2_tcon

commit 18f39e7b upstream.

As Raphael Geissert pointed out, tcon_error_exit can dereference tcon
and there is one path in which tcon can be null.
Signed-off-by: Steve French <smfrench@gmail.com>
Reported-by: Raphael Geissert <geissert@debian.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

fs/cifs/smb2pdu.c

@@ -916,6 +916,7 @@ SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 tcon_error_exit:
 	if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 		cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
+		if (tcon)
 			tcon->bad_network_name = true;
 	}
 	goto tcon_exit;