From patchwork Mon Oct 22 12:19:07 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prasad Pandit X-Patchwork-Id: 10651965 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4754D90 for ; Mon, 22 Oct 2018 12:22:15 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 20C71289C6 for ; Mon, 22 Oct 2018 12:22:15 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1233D289DD; Mon, 22 Oct 2018 12:22:15 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, 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 AD863289C6 for ; Mon, 22 Oct 2018 12:22:14 +0000 (UTC) Received: from localhost ([::1]:34715 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gEZDp-0005z7-PC for patchwork-qemu-devel@patchwork.kernel.org; Mon, 22 Oct 2018 08:22:13 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:33625) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gEZDD-0005fr-ER for qemu-devel@nongnu.org; Mon, 22 Oct 2018 08:21:36 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gEZD8-0007gT-JU for qemu-devel@nongnu.org; Mon, 22 Oct 2018 08:21:35 -0400 Received: from mx1.redhat.com ([209.132.183.28]:41712) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gEZD3-0007Xq-8T for qemu-devel@nongnu.org; Mon, 22 Oct 2018 08:21:27 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 143DE86675; Mon, 22 Oct 2018 12:21:18 +0000 (UTC) Received: from localhost.localdomain (vpn2-54-23.bne.redhat.com [10.64.54.23]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 8CF495D744; Mon, 22 Oct 2018 12:21:13 +0000 (UTC) From: P J P To: Qemu Developers Date: Mon, 22 Oct 2018 17:49:07 +0530 Message-Id: <20181022121907.13635-1-ppandit@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Mon, 22 Oct 2018 12:21:18 +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 3/3] ppc/pnv: check size before data buffer access 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: Moguofang , Prasad J Pandit , Alexander Graf , David Gibson 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 While performing PowerNV memory r/w operations, the access length 'sz' could exceed the data[4] buffer size. Add check to avoid OOB access. Reported-by: Moguofang Signed-off-by: Prasad J Pandit --- hw/ppc/pnv_lpc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/hw/ppc/pnv_lpc.c b/hw/ppc/pnv_lpc.c index d7721320a2..f5e5bd4053 100644 --- a/hw/ppc/pnv_lpc.c +++ b/hw/ppc/pnv_lpc.c @@ -158,6 +158,10 @@ static void pnv_lpc_do_eccb(PnvLpcController *lpc, uint64_t cmd) uint8_t data[4]; bool success; + if (sz > sizeof(data)) { + return; + } + if (cmd & ECCB_CTL_READ) { success = opb_read(lpc, opb_addr, data, sz); if (success) {