From patchwork Thu Feb 4 08:31:32 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Wang X-Patchwork-Id: 8214771 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id A48789F37A for ; Thu, 4 Feb 2016 08:34:37 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1A27E2037E for ; Thu, 4 Feb 2016 08:34:37 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4E2072037C for ; Thu, 4 Feb 2016 08:34:36 +0000 (UTC) Received: from localhost ([::1]:40238 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aRFN5-00030O-IP for patchwork-qemu-devel@patchwork.kernel.org; Thu, 04 Feb 2016 03:34:35 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34990) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aRFL8-0007Zo-VB for qemu-devel@nongnu.org; Thu, 04 Feb 2016 03:32:35 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aRFKl-0007Ws-KJ for qemu-devel@nongnu.org; Thu, 04 Feb 2016 03:32:34 -0500 Received: from mx1.redhat.com ([209.132.183.28]:51807) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aRFKl-0007Wk-EW for qemu-devel@nongnu.org; Thu, 04 Feb 2016 03:32:11 -0500 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) by mx1.redhat.com (Postfix) with ESMTPS id 1E4178E909; Thu, 4 Feb 2016 08:32:11 +0000 (UTC) Received: from jason-ThinkPad-T430s.redhat.com (vpn1-7-60.pek2.redhat.com [10.72.7.60]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u148VnLF022765; Thu, 4 Feb 2016 03:32:07 -0500 From: Jason Wang To: peter.maydell@linaro.org, qemu-devel@nongnu.org Date: Thu, 4 Feb 2016 16:31:32 +0800 Message-Id: <1454574706-5681-4-git-send-email-jasowang@redhat.com> In-Reply-To: <1454574706-5681-1-git-send-email-jasowang@redhat.com> References: <1454574706-5681-1-git-send-email-jasowang@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.27 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: Jason Wang , Prasad J Pandit Subject: [Qemu-devel] [PULL V2 03/17] net: cadence_gem: check packet size in gem_recieve 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+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Prasad J Pandit While receiving packets in 'gem_receive' routine, if Frame Check Sequence(FCS) is enabled, it copies the packet into a local buffer without checking its size. Add check to validate packet length against the buffer size to avoid buffer overflow. Reported-by: Ling Liu Signed-off-by: Prasad J Pandit Signed-off-by: Jason Wang --- hw/net/cadence_gem.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/hw/net/cadence_gem.c b/hw/net/cadence_gem.c index f9e4091..e513d9d 100644 --- a/hw/net/cadence_gem.c +++ b/hw/net/cadence_gem.c @@ -678,6 +678,10 @@ static ssize_t gem_receive(NetClientState *nc, const uint8_t *buf, size_t size) } else { unsigned crc_val; + if (size > sizeof(rxbuf) - sizeof(crc_val)) { + size = sizeof(rxbuf) - sizeof(crc_val); + } + bytes_to_copy = size; /* The application wants the FCS field, which QEMU does not provide. * We must try and calculate one. */