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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 B2C0BC2D0DB for ; Sun, 29 Dec 2019 18:04:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8DD71206A4 for ; Sun, 29 Dec 2019 18:04:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577642648; bh=ciSyz37F9cQweIjG5Hnz7Ev1ADzeKgeCzPX7574Wwg0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=eOI5LbTHiVhg7nWJ5TfhyLj8weDyH9UqitfOafHKJtKPTI5KFhdCYLSTVs+dZ1DDq iaOU10xPY+Gm1Ok7OmZ1zpNvxrFBsSiUykdQx+kGbhqZJLSxXiBtD1Uruv5hBrIEzv 2Uk1MjFGSZNscNsiJeAuQeafcYOqkLPS0vdVjhco= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732286AbfL2Rwg (ORCPT ); Sun, 29 Dec 2019 12:52:36 -0500 Received: from mail.kernel.org ([198.145.29.99]:38882 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731959AbfL2Rwf (ORCPT ); Sun, 29 Dec 2019 12:52:35 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 40316207FF; Sun, 29 Dec 2019 17:52:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1577641954; bh=ciSyz37F9cQweIjG5Hnz7Ev1ADzeKgeCzPX7574Wwg0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Tg4ugp1Wg+i9mj+REKlcgXdM73nONt3Lg568BUErDlSq9o8fafmGewyYfFu5R+spN OzuuanPHjzQ27RaFdxUJME+rVEIGVmBnk7Dl/06kJ7vvPSgx6kp2mm8d0vRAETf/1U l3IvzjAxYHnXPxY0Bh7lonx9hnxKovpt1szEk2/s= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Takashi Iwai , Sasha Levin Subject: [PATCH 5.4 239/434] ALSA: timer: Limit max amount of slave instances Date: Sun, 29 Dec 2019 18:24:52 +0100 Message-Id: <20191229172717.757705858@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20191229172702.393141737@linuxfoundation.org> References: <20191229172702.393141737@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Takashi Iwai [ Upstream commit fdea53fe5de532969a332d6e5e727f2ad8bf084d ] The fuzzer tries to open the timer instances as much as possible, and this may cause a system hiccup easily. We've already introduced the cap for the max number of available instances for the h/w timers, and we should put such a limit also to the slave timers, too. This patch introduces the limit to the multiple opened slave timers. The upper limit is hard-coded to 1000 for now, which should suffice for any practical usages up to now. Link: https://lore.kernel.org/r/20191106154257.5853-1-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/core/timer.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/sound/core/timer.c b/sound/core/timer.c index 59ae21b0bb93..013f0e69ff0f 100644 --- a/sound/core/timer.c +++ b/sound/core/timer.c @@ -74,6 +74,9 @@ static LIST_HEAD(snd_timer_slave_list); /* lock for slave active lists */ static DEFINE_SPINLOCK(slave_active_lock); +#define MAX_SLAVE_INSTANCES 1000 +static int num_slaves; + static DEFINE_MUTEX(register_mutex); static int snd_timer_free(struct snd_timer *timer); @@ -252,6 +255,10 @@ int snd_timer_open(struct snd_timer_instance **ti, err = -EINVAL; goto unlock; } + if (num_slaves >= MAX_SLAVE_INSTANCES) { + err = -EBUSY; + goto unlock; + } timeri = snd_timer_instance_new(owner, NULL); if (!timeri) { err = -ENOMEM; @@ -261,6 +268,7 @@ int snd_timer_open(struct snd_timer_instance **ti, timeri->slave_id = tid->device; timeri->flags |= SNDRV_TIMER_IFLG_SLAVE; list_add_tail(&timeri->open_list, &snd_timer_slave_list); + num_slaves++; err = snd_timer_check_slave(timeri); if (err < 0) { snd_timer_close_locked(timeri, &card_dev_to_put); @@ -356,6 +364,8 @@ static int snd_timer_close_locked(struct snd_timer_instance *timeri, } list_del(&timeri->open_list); + if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE) + num_slaves--; /* force to stop the timer */ snd_timer_stop(timeri); -- 2.20.1