From patchwork Tue Mar 8 07:52:33 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 593912 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 02084140B99 for ; Tue, 8 Mar 2016 18:53:25 +1100 (AEDT) Received: from localhost ([::1]:32801 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1adCSJ-0005Cc-5U for incoming@patchwork.ozlabs.org; Tue, 08 Mar 2016 02:53:23 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33289) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1adCRv-0004VB-SG for qemu-devel@nongnu.org; Tue, 08 Mar 2016 02:53:00 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1adCRu-00009F-UE for qemu-devel@nongnu.org; Tue, 08 Mar 2016 02:52:59 -0500 Received: from mx1.redhat.com ([209.132.183.28]:47938) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1adCRu-000099-H9 for qemu-devel@nongnu.org; Tue, 08 Mar 2016 02:52:58 -0500 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) by mx1.redhat.com (Postfix) with ESMTPS id 0DD7164373; Tue, 8 Mar 2016 07:52:58 +0000 (UTC) Received: from jason-ThinkPad-T430s.redhat.com (vpn1-5-240.pek2.redhat.com [10.72.5.240]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u287qkMX010527; Tue, 8 Mar 2016 02:52:53 -0500 From: Jason Wang To: peter.maydell@linaro.org, qemu-devel@nongnu.org Date: Tue, 8 Mar 2016 15:52:33 +0800 Message-Id: <1457423564-9724-2-git-send-email-jasowang@redhat.com> In-Reply-To: <1457423564-9724-1-git-send-email-jasowang@redhat.com> References: <1457423564-9724-1-git-send-email-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Tue, 08 Mar 2016 07:52:58 +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 Cc: Jason Wang , Prasad J Pandit Subject: [Qemu-devel] [PULL V2 01/12] net: ne2000: check ring buffer control registers X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Prasad J Pandit Ne2000 NIC uses ring buffer of NE2000_MEM_SIZE(49152) bytes to process network packets. Registers PSTART & PSTOP define ring buffer size & location. Setting these registers to invalid values could lead to infinite loop or OOB r/w access issues. Add check to avoid it. Reported-by: Yang Hongke Tested-by: Yang Hongke Signed-off-by: Prasad J Pandit Signed-off-by: Jason Wang --- hw/net/ne2000.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/hw/net/ne2000.c b/hw/net/ne2000.c index e408083..f0feaf9 100644 --- a/hw/net/ne2000.c +++ b/hw/net/ne2000.c @@ -155,6 +155,10 @@ static int ne2000_buffer_full(NE2000State *s) { int avail, index, boundary; + if (s->stop <= s->start) { + return 1; + } + index = s->curpag << 8; boundary = s->boundary << 8; if (index < boundary)