From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7020CCCA47B for ; Mon, 13 Jun 2022 13:41:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377927AbiFMNkh (ORCPT ); Mon, 13 Jun 2022 09:40:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58196 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1378583AbiFMNjB (ORCPT ); Mon, 13 Jun 2022 09:39:01 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 70FD878903; Mon, 13 Jun 2022 04:27:44 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 8B67AB80EA7; Mon, 13 Jun 2022 11:27:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E1A87C3411C; Mon, 13 Jun 2022 11:27:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1655119661; bh=en1CA4PgGFixgLpDhr7POFl9urAhKt9dpcuax8g1kts=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TKO1GF5yRp38AAFO9LHig/t1rx40v+0WButPNgAXHplurfcIZ4hsQNTvEBEyjzlse IcaPPu3iBzOZAR+Q21TW7L5oXS6W7uRPTGzKIInYmos0XkE/8GRH+8k9X0rzZlr1/U 3/GR99ObkjhyHW13psyZ2bdG3SuoBb/4u8oG2eSo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Srinivas Kandagatla , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Sasha Levin Subject: [PATCH 5.18 073/339] serial: st-asc: Sanitize CSIZE and correct PARENB for CS7 Date: Mon, 13 Jun 2022 12:08:18 +0200 Message-Id: <20220613094928.736274885@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220613094926.497929857@linuxfoundation.org> References: <20220613094926.497929857@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Ilpo Järvinen [ Upstream commit 52bb1cb7118564166b04d52387bd8403632f5190 ] Only CS7 and CS8 seem supported but CSIZE is not sanitized from CS5 or CS6 to CS8. In addition, ASC_CTL_MODE_7BIT_PAR suggests that CS7 has to have parity, thus add PARENB. Incorrect CSIZE results in miscalculation of the frame bits in tty_get_char_size() or in its predecessor where the roughly the same code is directly within uart_update_timeout(). Fixes: c4b058560762 (serial:st-asc: Add ST ASC driver.) Cc: Srinivas Kandagatla Signed-off-by: Ilpo Järvinen Link: https://lore.kernel.org/r/20220519081808.3776-8-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/st-asc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c index d7fd692286cf..1b0da603ab54 100644 --- a/drivers/tty/serial/st-asc.c +++ b/drivers/tty/serial/st-asc.c @@ -535,10 +535,14 @@ static void asc_set_termios(struct uart_port *port, struct ktermios *termios, /* set character length */ if ((cflag & CSIZE) == CS7) { ctrl_val |= ASC_CTL_MODE_7BIT_PAR; + cflag |= PARENB; } else { ctrl_val |= (cflag & PARENB) ? ASC_CTL_MODE_8BIT_PAR : ASC_CTL_MODE_8BIT; + cflag &= ~CSIZE; + cflag |= CS8; } + termios->c_cflag = cflag; /* set stop bit */ ctrl_val |= (cflag & CSTOPB) ? ASC_CTL_STOP_2BIT : ASC_CTL_STOP_1BIT; -- 2.35.1