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=-9.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 C2347C388F7 for ; Fri, 13 Nov 2020 12:37:15 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3E0DF20797 for ; Fri, 13 Nov 2020 12:37:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="CZhsA9pm" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3E0DF20797 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:35994 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kdYKI-00047Q-Ai for qemu-devel@archiver.kernel.org; Fri, 13 Nov 2020 07:37:14 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:37764) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kdYDP-0005gl-MM for qemu-devel@nongnu.org; Fri, 13 Nov 2020 07:30:07 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:39936) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kdYDN-0002Dq-Hu for qemu-devel@nongnu.org; Fri, 13 Nov 2020 07:30:07 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1605270604; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=01YOpODs8NsGDC5aHy3lduCtkHiMuIvOYMSs40O//qQ=; b=CZhsA9pm1/RxIY2lagUXgRk6KEnzW+ViZ4E7alE3ahf2ayHfHF1g0mI8lArxGSA04QkBBs zv+hwevi54Ofd7XWInj2/glGmFUs9Q/+ldz+VelNYcHl14FvV8OVlIKYdIDLi3ov9wiXw+ jW3OC0Vixsbo/aw66+2L46RpMJHVT+k= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-380-176k0S0OPUubnGPw_BfwfA-1; Fri, 13 Nov 2020 07:30:00 -0500 X-MC-Unique: 176k0S0OPUubnGPw_BfwfA-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 9EA1B6D246; Fri, 13 Nov 2020 12:29:59 +0000 (UTC) Received: from sirius.home.kraxel.org (ovpn-112-65.ams2.redhat.com [10.36.112.65]) by smtp.corp.redhat.com (Postfix) with ESMTP id 48DF460BE2; Fri, 13 Nov 2020 12:29:56 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 5FA48A1EE; Fri, 13 Nov 2020 13:29:55 +0100 (CET) From: Gerd Hoffmann To: qemu-devel@nongnu.org Subject: [PULL 1/6] audio/jack: fix use after free segfault Date: Fri, 13 Nov 2020 13:29:50 +0100 Message-Id: <20201113122955.759-2-kraxel@redhat.com> In-Reply-To: <20201113122955.759-1-kraxel@redhat.com> References: <20201113122955.759-1-kraxel@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=kraxel@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" Received-SPF: pass client-ip=63.128.21.124; envelope-from=kraxel@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/12 16:09:27 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Geoffrey McRae , Christian Schoenebeck , Gerd Hoffmann Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Geoffrey McRae This change registers a bottom handler to close the JACK client connection when a server shutdown signal is received. Without this libjack2 attempts to "clean up" old clients and causes a use after free segfault. Signed-off-by: Geoffrey McRae Reviewed-by: Christian Schoenebeck Message-Id: <20201108063351.35804-2-geoff@hostfission.com> Signed-off-by: Gerd Hoffmann --- audio/jackaudio.c | 50 +++++++++++++++++++++++++++++++++++------------ 1 file changed, 37 insertions(+), 13 deletions(-) diff --git a/audio/jackaudio.c b/audio/jackaudio.c index 1e714b30bc8a..3b7c18443dbe 100644 --- a/audio/jackaudio.c +++ b/audio/jackaudio.c @@ -25,6 +25,7 @@ #include "qemu/osdep.h" #include "qemu/module.h" #include "qemu/atomic.h" +#include "qemu/main-loop.h" #include "qemu-common.h" #include "audio.h" @@ -63,6 +64,7 @@ typedef struct QJackClient { QJackState state; jack_client_t *client; jack_nframes_t freq; + QEMUBH *shutdown_bh; struct QJack *j; int nchannels; @@ -87,6 +89,7 @@ QJackIn; static int qjack_client_init(QJackClient *c); static void qjack_client_connect_ports(QJackClient *c); static void qjack_client_fini(QJackClient *c); +static QemuMutex qjack_shutdown_lock; static void qjack_buffer_create(QJackBuffer *buffer, int channels, int frames) { @@ -306,21 +309,27 @@ static int qjack_xrun(void *arg) return 0; } +static void qjack_shutdown_bh(void *opaque) +{ + QJackClient *c = (QJackClient *)opaque; + qjack_client_fini(c); +} + static void qjack_shutdown(void *arg) { QJackClient *c = (QJackClient *)arg; c->state = QJACK_STATE_SHUTDOWN; + qemu_bh_schedule(c->shutdown_bh); } static void qjack_client_recover(QJackClient *c) { - if (c->state == QJACK_STATE_SHUTDOWN) { - qjack_client_fini(c); + if (c->state != QJACK_STATE_DISCONNECTED) { + return; } /* packets is used simply to throttle this */ - if (c->state == QJACK_STATE_DISCONNECTED && - c->packets % 100 == 0) { + if (c->packets % 100 == 0) { /* if enabled then attempt to recover */ if (c->enabled) { @@ -489,15 +498,16 @@ static int qjack_init_out(HWVoiceOut *hw, struct audsettings *as, QJackOut *jo = (QJackOut *)hw; Audiodev *dev = (Audiodev *)drv_opaque; - qjack_client_fini(&jo->c); - jo->c.out = true; jo->c.enabled = false; jo->c.nchannels = as->nchannels; jo->c.opt = dev->u.jack.out; + jo->c.shutdown_bh = qemu_bh_new(qjack_shutdown_bh, &jo->c); + int ret = qjack_client_init(&jo->c); if (ret != 0) { + qemu_bh_delete(jo->c.shutdown_bh); return ret; } @@ -525,15 +535,16 @@ static int qjack_init_in(HWVoiceIn *hw, struct audsettings *as, QJackIn *ji = (QJackIn *)hw; Audiodev *dev = (Audiodev *)drv_opaque; - qjack_client_fini(&ji->c); - ji->c.out = false; ji->c.enabled = false; ji->c.nchannels = as->nchannels; ji->c.opt = dev->u.jack.in; + ji->c.shutdown_bh = qemu_bh_new(qjack_shutdown_bh, &ji->c); + int ret = qjack_client_init(&ji->c); if (ret != 0) { + qemu_bh_delete(ji->c.shutdown_bh); return ret; } @@ -555,7 +566,7 @@ static int qjack_init_in(HWVoiceIn *hw, struct audsettings *as, return 0; } -static void qjack_client_fini(QJackClient *c) +static void qjack_client_fini_locked(QJackClient *c) { switch (c->state) { case QJACK_STATE_RUNNING: @@ -564,28 +575,40 @@ static void qjack_client_fini(QJackClient *c) case QJACK_STATE_SHUTDOWN: jack_client_close(c->client); + c->client = NULL; + + qjack_buffer_free(&c->fifo); + g_free(c->port); + + c->state = QJACK_STATE_DISCONNECTED; /* fallthrough */ case QJACK_STATE_DISCONNECTED: break; } +} - qjack_buffer_free(&c->fifo); - g_free(c->port); - - c->state = QJACK_STATE_DISCONNECTED; +static void qjack_client_fini(QJackClient *c) +{ + qemu_mutex_lock(&qjack_shutdown_lock); + qjack_client_fini_locked(c); + qemu_mutex_unlock(&qjack_shutdown_lock); } static void qjack_fini_out(HWVoiceOut *hw) { QJackOut *jo = (QJackOut *)hw; qjack_client_fini(&jo->c); + + qemu_bh_delete(jo->c.shutdown_bh); } static void qjack_fini_in(HWVoiceIn *hw) { QJackIn *ji = (QJackIn *)hw; qjack_client_fini(&ji->c); + + qemu_bh_delete(ji->c.shutdown_bh); } static void qjack_enable_out(HWVoiceOut *hw, bool enable) @@ -662,6 +685,7 @@ static void qjack_info(const char *msg) static void register_audio_jack(void) { + qemu_mutex_init(&qjack_shutdown_lock); audio_driver_register(&jack_driver); jack_set_thread_creator(qjack_thread_creator); jack_set_error_function(qjack_error); -- 2.27.0