From nobody Sun Feb 8 14:14:27 2026 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 A5D67C3F6B0 for ; Tue, 23 Aug 2022 10:04:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352200AbiHWKEp (ORCPT ); Tue, 23 Aug 2022 06:04:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58678 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351769AbiHWKAg (ORCPT ); Tue, 23 Aug 2022 06:00:36 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9884FCD2; Tue, 23 Aug 2022 01:48:18 -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 E48BBB81C28; Tue, 23 Aug 2022 08:48:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 144D0C433C1; Tue, 23 Aug 2022 08:48:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1661244496; bh=urTZsfCXeDz7WoRcA6SCxIYIvurGxHNJ0Xuosy9QH3E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JWXSq3BMOH938qrTOe9PffYlIYyFX84Th0EDh7rFUhwT/byMisNKS1h7drqh1hcr0 O4tMs/e3MEHgLslTitYZygo8dYLMBZP7LLswqurIwocnEIVaQV+phc1tXGUhmSKzim k/1dspRg/8PhfS0AQdztgHRJDQ16g5WiDVrGLf60= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Daniel Starke , Sasha Levin Subject: [PATCH 4.14 128/229] tty: n_gsm: fix DM command Date: Tue, 23 Aug 2022 10:24:49 +0200 Message-Id: <20220823080058.298743401@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220823080053.202747790@linuxfoundation.org> References: <20220823080053.202747790@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Daniel Starke [ Upstream commit 18a948c7d90995d127785e308fa7b701df4c499f ] n_gsm is based on the 3GPP 07.010 and its newer version is the 3GPP 27.010. See https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDeta= ils.aspx?specificationId=3D1516 The changes from 07.010 to 27.010 are non-functional. Therefore, I refer to the newer 27.010 here. Chapter 5.3.3 defines the DM response. There exists no DM command. However, the current implementation incorrectly sends DM as command in case of unexpected UIH frames in gsm_queue(). Correct this behavior by always sending DM as response. Fixes: e1eaea46bb40 ("tty: n_gsm line discipline") Signed-off-by: Daniel Starke Link: https://lore.kernel.org/r/20220707113223.3685-2-daniel.starke@siemens= .com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/n_gsm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index 5f5a7ad4c46a..1d50f3ab4e5a 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -1906,7 +1906,7 @@ static void gsm_queue(struct gsm_mux *gsm) goto invalid; #endif if (dlci =3D=3D NULL || dlci->state !=3D DLCI_OPEN) { - gsm_command(gsm, address, DM|PF); + gsm_response(gsm, address, DM|PF); return; } dlci->data(dlci, gsm->buf, gsm->len); --=20 2.35.1