From patchwork Wed Oct 12 09:10:55 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prasad Pandit X-Patchwork-Id: 9372299 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id C55DF60487 for ; Wed, 12 Oct 2016 09:14:52 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B420C293FF for ; Wed, 12 Oct 2016 09:14:52 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A8F7F2940E; Wed, 12 Oct 2016 09:14:52 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 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.wl.linuxfoundation.org (Postfix) with ESMTPS id 87089293FF for ; Wed, 12 Oct 2016 09:14:51 +0000 (UTC) Received: from localhost ([::1]:60177 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1buFcg-000509-CE for patchwork-qemu-devel@patchwork.kernel.org; Wed, 12 Oct 2016 05:14:50 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37451) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1buFZ9-0002EF-4a for qemu-devel@nongnu.org; Wed, 12 Oct 2016 05:11:12 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1buFZ4-0000ZC-2F for qemu-devel@nongnu.org; Wed, 12 Oct 2016 05:11:10 -0400 Received: from mx1.redhat.com ([209.132.183.28]:48102) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1buFZ3-0000Z5-SA for qemu-devel@nongnu.org; Wed, 12 Oct 2016 05:11:05 -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 27C3731B306; Wed, 12 Oct 2016 09:11:05 +0000 (UTC) Received: from javelin.localdomain (vpn1-4-55.sin2.redhat.com [10.67.4.55]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u9C9Avdk031662 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 12 Oct 2016 05:11:03 -0400 From: P J P To: Qemu Developers Date: Wed, 12 Oct 2016 14:40:55 +0530 Message-Id: <1476263455-24839-1-git-send-email-ppandit@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 [10.5.110.29]); Wed, 12 Oct 2016 09:11:05 +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] [PATCH] net: rocker: set limit to DMA buffer size 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: Huawei PSIRT , Jason Wang , Jiri Pirko , Prasad J Pandit Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Prasad J Pandit Rocker network switch emulator has test registers to help debug DMA operations. While testing host DMA access, a buffer address is written to register 'TEST_DMA_ADDR' and its size is written to register 'TEST_DMA_SIZE'. When performing TEST_DMA_CTRL_INVERT test, if DMA buffer size was greater than 'INT_MAX', it leads to an invalid buffer access. Limit the DMA buffer size to avoid it. Reported-by: Huawei PSIRT Signed-off-by: Prasad J Pandit Reviewed-by: Jiri Pirko --- hw/net/rocker/rocker.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/net/rocker/rocker.c b/hw/net/rocker/rocker.c index 30f2ce4..e9d215a 100644 --- a/hw/net/rocker/rocker.c +++ b/hw/net/rocker/rocker.c @@ -860,7 +860,7 @@ static void rocker_io_writel(void *opaque, hwaddr addr, uint32_t val) rocker_msix_irq(r, val); break; case ROCKER_TEST_DMA_SIZE: - r->test_dma_size = val; + r->test_dma_size = val & 0xFFFF; break; case ROCKER_TEST_DMA_ADDR + 4: r->test_dma_addr = ((uint64_t)val) << 32 | r->lower32;