From patchwork Wed May 12 14:45:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "gregkh@linuxfoundation.org" X-Patchwork-Id: 437962 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CE76EC43619 for ; Wed, 12 May 2021 16:45:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E14326121E for ; Wed, 12 May 2021 16:45:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242733AbhELQpY (ORCPT ); Wed, 12 May 2021 12:45:24 -0400 Received: from mail.kernel.org ([198.145.29.99]:57420 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239323AbhELQhG (ORCPT ); Wed, 12 May 2021 12:37:06 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 114C761E2C; Wed, 12 May 2021 16:02:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620835331; bh=E8NAsm444CS1PX3bfV1zlCkMeo/zNbsFaO2va+Kysok=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=szSmMC4OFfaylDCuhwfzMbnXrD7f+RbYUgMxs6xmJip8iIia6xk8iRcYYPcM9fNje RZyKyXI8B2buXQ7akmztYivxBlvzoW/Q3j6S4Q49Tsq6SbfIyu8YjSGfPGbgwjfKUc KxrE/tK69QWQUUq9r65SKMMhT1FXF6OzeyqB9L68= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hovold , Sasha Levin Subject: [PATCH 5.12 266/677] staging: fwserial: fix TIOCSSERIAL implementation Date: Wed, 12 May 2021 16:45:12 +0200 Message-Id: <20210512144846.068133398@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144837.204217980@linuxfoundation.org> References: <20210512144837.204217980@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Johan Hovold [ Upstream commit a7eaaa9d1032e68669bb479496087ba8fc155ab6 ] TIOCSSERIAL is a horrid, underspecified, legacy interface which for most serial devices is only useful for setting the close_delay and closing_wait parameters. A non-privileged user has only ever been able to set the since long deprecated ASYNC_SPD flags and trying to change any other *supported* feature should result in -EPERM being returned. Setting the current values for any supported features should return success. Fix the fwserial implementation which was returning -EPERM also for a privileged user when trying to change certain unsupported parameters, and instead return success consistently. Fixes: 7355ba3445f2 ("staging: fwserial: Add TTY-over-Firewire serial driver") Signed-off-by: Johan Hovold Link: https://lore.kernel.org/r/20210407102334.32361-4-johan@kernel.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/staging/fwserial/fwserial.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/drivers/staging/fwserial/fwserial.c b/drivers/staging/fwserial/fwserial.c index 440d11423812..2888b80a2c1a 100644 --- a/drivers/staging/fwserial/fwserial.c +++ b/drivers/staging/fwserial/fwserial.c @@ -1234,10 +1234,6 @@ static int set_serial_info(struct tty_struct *tty, struct fwtty_port *port = tty->driver_data; unsigned int cdelay; - if (ss->irq != 0 || ss->port != 0 || ss->custom_divisor != 0 || - ss->baud_base != 400000000) - return -EPERM; - cdelay = msecs_to_jiffies(ss->close_delay * 10); mutex_lock(&port->port.mutex);