From nobody Fri Oct 24 20:26:23 2025 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 9746BC25B08 for ; Mon, 15 Aug 2022 22:40:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350658AbiHOWkF (ORCPT ); Mon, 15 Aug 2022 18:40:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54670 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348953AbiHOWeM (ORCPT ); Mon, 15 Aug 2022 18:34:12 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E9EB470E72; Mon, 15 Aug 2022 12:49:34 -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 C89D06122B; Mon, 15 Aug 2022 19:49:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B5E5FC433D6; Mon, 15 Aug 2022 19:49:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1660592974; bh=HAgF+QZyq7BwwqLqpaRvWir0GnzA1N0v4RZ9HqRJ7ko=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iUQ12fr9DzSratNurm9taG/M/U0q9bOQfTY85XxK36BP0zjCwNOqF5zXW/0LboxlD svvGirAcT/W6erj3IQppyzID8ckua+vf6Fi38ESASVAGTw3EawZUrCa88VSxY8ZRa5 uTo3/l84A8yHrY76Bn9C2qDQDLv8UY2ccktlWF5c= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Daniel Starke , Sasha Levin Subject: [PATCH 5.18 0874/1095] tty: n_gsm: fix missing corner cases in gsmld_poll() Date: Mon, 15 Aug 2022 20:04:33 +0200 Message-Id: <20220815180505.522422313@linuxfoundation.org> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220815180429.240518113@linuxfoundation.org> References: <20220815180429.240518113@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 7e5b4322cde067e1d0f1bf8f490e93f664a7c843 ] gsmld_poll() currently fails to handle the following corner cases correctly: - remote party closed the associated tty Add the missing checks and map those to EPOLLHUP. Reorder the checks to group them by their reaction. Fixes: e1eaea46bb40 ("tty: n_gsm line discipline") Signed-off-by: Daniel Starke Link: https://lore.kernel.org/r/20220707113223.3685-4-daniel.starke@siemens= .com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/n_gsm.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index 7749de4f269a..3dd71ede4cd4 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -3057,12 +3057,15 @@ static __poll_t gsmld_poll(struct tty_struct *tty, = struct file *file, =20 poll_wait(file, &tty->read_wait, wait); poll_wait(file, &tty->write_wait, wait); + + if (gsm->dead) + mask |=3D EPOLLHUP; if (tty_hung_up_p(file)) mask |=3D EPOLLHUP; + if (test_bit(TTY_OTHER_CLOSED, &tty->flags)) + mask |=3D EPOLLHUP; if (!tty_is_writelocked(tty) && tty_write_room(tty) > 0) mask |=3D EPOLLOUT | EPOLLWRNORM; - if (gsm->dead) - mask |=3D EPOLLHUP; return mask; } =20 --=20 2.35.1