From patchwork Thu Sep 19 08:36:27 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Gerd Hoffmann X-Patchwork-Id: 11151899 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 552E513BD for ; Thu, 19 Sep 2019 08:56:07 +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 3587F21907 for ; Thu, 19 Sep 2019 08:56:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3587F21907 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:40368 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iAsEP-0002ye-Tt for patchwork-qemu-devel@patchwork.kernel.org; Thu, 19 Sep 2019 04:56:05 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:35831) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iArvk-000595-4r for qemu-devel@nongnu.org; Thu, 19 Sep 2019 04:36:52 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iArvg-0000H1-Af for qemu-devel@nongnu.org; Thu, 19 Sep 2019 04:36:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:41100) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iArvf-0000GL-UK for qemu-devel@nongnu.org; Thu, 19 Sep 2019 04:36:44 -0400 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 mx1.redhat.com (Postfix) with ESMTPS id E2CB630832C8; Thu, 19 Sep 2019 08:36:42 +0000 (UTC) Received: from sirius.home.kraxel.org (ovpn-116-47.ams2.redhat.com [10.36.116.47]) by smtp.corp.redhat.com (Postfix) with ESMTP id D904360C18; Thu, 19 Sep 2019 08:36:40 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 915981FCC2; Thu, 19 Sep 2019 10:36:30 +0200 (CEST) From: Gerd Hoffmann To: qemu-devel@nongnu.org Date: Thu, 19 Sep 2019 10:36:27 +0200 Message-Id: <20190919083629.29998-25-kraxel@redhat.com> In-Reply-To: <20190919083629.29998-1-kraxel@redhat.com> References: <20190919083629.29998-1-kraxel@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.44]); Thu, 19 Sep 2019 08:36:42 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 24/26] usbaudio: change playback counters to 64 bit 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: =?unknown-8bit?b?S8WRdsOhZ8OzQHJlZGhhdC5jb20sID0/VVRGLTg/cT9ab2x0PUMz?= =?unknown-8bit?b?PUExbj89IDxEaXJ0WS5pQ0UuaHVAZ21haWwuY29tPiwgR2VyZCBIb2Zm?= =?unknown-8bit?b?bWFubiA8a3JheGVsQHJlZGhhdC5jb20+LCBNYXJrdXMgQXJtYnJ1c3Rl?= =?unknown-8bit?b?ciA8YXJtYnJ1QHJlZGhhdC5jb20+?= Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" From: Kővágó, Zoltán With stereo playback, they need about 375 minutes of continuous audio playback to overflow, which is usually not a problem (as stopping and later resuming playback resets the counters). But with 7.1 audio, they only need about 95 minutes to overflow. After the overflow, the buf->prod % USBAUDIO_PACKET_SIZE(channels) assertion no longer holds true, which will result in overflowing the buffer. With 64 bit variables, it would take about 762000 years to overflow. Signed-off-by: Kővágó, Zoltán Message-id: c0a8d934c145bab55506e0623cc0206e2632a196.1568574965.git.DirtY.iCE.hu@gmail.com Signed-off-by: Gerd Hoffmann --- hw/usb/dev-audio.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/hw/usb/dev-audio.c b/hw/usb/dev-audio.c index e42bdfbdc101..ea604bbb8e4a 100644 --- a/hw/usb/dev-audio.c +++ b/hw/usb/dev-audio.c @@ -578,9 +578,9 @@ static const USBDesc desc_audio_multi = { struct streambuf { uint8_t *data; - uint32_t size; - uint32_t prod; - uint32_t cons; + size_t size; + uint64_t prod; + uint64_t cons; }; static void streambuf_init(struct streambuf *buf, uint32_t size, @@ -601,7 +601,7 @@ static void streambuf_fini(struct streambuf *buf) static int streambuf_put(struct streambuf *buf, USBPacket *p, uint32_t channels) { - uint32_t free = buf->size - (buf->prod - buf->cons); + int64_t free = buf->size - (buf->prod - buf->cons); if (free < USBAUDIO_PACKET_SIZE(channels)) { return 0; @@ -610,6 +610,8 @@ static int streambuf_put(struct streambuf *buf, USBPacket *p, uint32_t channels) return 0; } + /* can happen if prod overflows */ + assert(buf->prod % USBAUDIO_PACKET_SIZE(channels) == 0); usb_packet_copy(p, buf->data + (buf->prod % buf->size), USBAUDIO_PACKET_SIZE(channels)); buf->prod += USBAUDIO_PACKET_SIZE(channels); @@ -618,10 +620,10 @@ static int streambuf_put(struct streambuf *buf, USBPacket *p, uint32_t channels) static uint8_t *streambuf_get(struct streambuf *buf, size_t *len) { - uint32_t used = buf->prod - buf->cons; + int64_t used = buf->prod - buf->cons; uint8_t *data; - if (!used) { + if (used <= 0) { *len = 0; return NULL; }