From patchwork Mon May 16 19:36:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 573382 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 79EC0C433EF for ; Mon, 16 May 2022 19:47:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233803AbiEPTrE (ORCPT ); Mon, 16 May 2022 15:47:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35606 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346230AbiEPTp7 (ORCPT ); Mon, 16 May 2022 15:45:59 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A8DC83EF20; Mon, 16 May 2022 12:43:25 -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 dfw.source.kernel.org (Postfix) with ESMTPS id 6F6F061510; Mon, 16 May 2022 19:43:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 79A59C34100; Mon, 16 May 2022 19:43:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652730203; bh=w3nI1hObtd0qtOIqxJWRG2ianj1jmQMnACDUd0X2K8U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zsSUQNbjh+RI6vwFa9V70IFjjWoWRBmeaajeHtdRn9P+z7izGu2pi4NsO1y62A359 1IeJONT8rEYHJdqQe25RhAR5/ms8q9TrZVbE8Sdir0AcNh0J4BFRE9JvS9JJrha/FN JOME3Fz26fw/+drV0FM5wlLlwmv5qK7wf2eaLrEg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Daniel Starke Subject: [PATCH 5.4 25/43] tty: n_gsm: fix mux activation issues in gsm_config() Date: Mon, 16 May 2022 21:36:36 +0200 Message-Id: <20220516193615.461685912@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220516193614.714657361@linuxfoundation.org> References: <20220516193614.714657361@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Daniel Starke commit edd5f60c340086891fab094ad61270d6c80f9ca4 upstream. The current implementation activates the mux if it was restarted and opens the control channel if the mux was previously closed and we are now acting as initiator instead of responder, which is the default setting. This has two issues. 1) No mux is activated if we keep all default values and only switch to initiator. The control channel is not allocated but will be opened next which results in a NULL pointer dereference. 2) Switching the configuration after it was once configured while keeping the initiator value the same will not reopen the control channel if it was closed due to parameter incompatibilities. The mux remains dead. Fix 1) by always activating the mux if it is dead after configuration. Fix 2) by always opening the control channel after mux activation. Fixes: e1eaea46bb40 ("tty: n_gsm line discipline") Cc: stable@vger.kernel.org Signed-off-by: Daniel Starke Link: https://lore.kernel.org/r/20220504081733.3494-2-daniel.starke@siemens.com Signed-off-by: Greg Kroah-Hartman --- drivers/tty/n_gsm.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -2259,6 +2259,7 @@ static void gsm_copy_config_values(struc static int gsm_config(struct gsm_mux *gsm, struct gsm_config *c) { + int ret = 0; int need_close = 0; int need_restart = 0; @@ -2334,10 +2335,13 @@ static int gsm_config(struct gsm_mux *gs * FIXME: We need to separate activation/deactivation from adding * and removing from the mux array */ - if (need_restart) - gsm_activate_mux(gsm); - if (gsm->initiator && need_close) - gsm_dlci_begin_open(gsm->dlci[0]); + if (gsm->dead) { + ret = gsm_activate_mux(gsm); + if (ret) + return ret; + if (gsm->initiator) + gsm_dlci_begin_open(gsm->dlci[0]); + } return 0; }