From patchwork Mon May 23 02:13:44 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 624999 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 3rChw00WqSz9sCp for ; Mon, 23 May 2016 12:15:28 +1000 (AEST) Received: from localhost ([::1]:45206 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b4fOv-0000UP-M3 for incoming@patchwork.ozlabs.org; Sun, 22 May 2016 22:15:25 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49516) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b4fNm-0007rL-Gb for qemu-devel@nongnu.org; Sun, 22 May 2016 22:14:15 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1b4fNl-0002d5-9r for qemu-devel@nongnu.org; Sun, 22 May 2016 22:14:14 -0400 Received: from mx1.redhat.com ([209.132.183.28]:44195) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b4fNl-0002ct-3h for qemu-devel@nongnu.org; Sun, 22 May 2016 22:14:13 -0400 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id BE0D862668; Mon, 23 May 2016 02:14:12 +0000 (UTC) Received: from jason-ThinkPad-T450s.redhat.com (vpn1-7-188.pek2.redhat.com [10.72.7.188]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u4N2E4ws000739; Sun, 22 May 2016 22:14:10 -0400 From: Jason Wang To: peter.maydell@linaro.org, qemu-devel@nongnu.org Date: Mon, 23 May 2016 10:13:44 +0800 Message-Id: <1463969642-5908-3-git-send-email-jasowang@redhat.com> In-Reply-To: <1463969642-5908-1-git-send-email-jasowang@redhat.com> References: <1463969642-5908-1-git-send-email-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Mon, 23 May 2016 02:14:12 +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 02/20] net: mipsnet: check packet length against buffer X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jason Wang , Prasad J Pandit Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Prasad J Pandit When receiving packets over MIPSnet network device, it uses receive buffer of size 1514 bytes. In case the controller accepts large(MTU) packets, it could lead to memory corruption. Add check to avoid it. Reported by: Oleksandr Bazhaniuk Signed-off-by: Prasad J Pandit Signed-off-by: Jason Wang --- hw/net/mipsnet.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/hw/net/mipsnet.c b/hw/net/mipsnet.c index 740cd98..cf8b823 100644 --- a/hw/net/mipsnet.c +++ b/hw/net/mipsnet.c @@ -83,6 +83,9 @@ static ssize_t mipsnet_receive(NetClientState *nc, const uint8_t *buf, size_t si if (!mipsnet_can_receive(nc)) return 0; + if (size >= sizeof(s->rx_buffer)) { + return 0; + } s->busy = 1; /* Just accept everything. */