From patchwork Wed Oct 14 23:04:25 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Verma, Vishal L" X-Patchwork-Id: 7398971 Return-Path: X-Original-To: patchwork-linux-acpi@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 46B7F9F302 for ; Wed, 14 Oct 2015 23:04:51 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 6F67C2065D for ; Wed, 14 Oct 2015 23:04:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 84815209C4 for ; Wed, 14 Oct 2015 23:04:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754159AbbJNXEt (ORCPT ); Wed, 14 Oct 2015 19:04:49 -0400 Received: from mga09.intel.com ([134.134.136.24]:9510 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753988AbbJNXEs (ORCPT ); Wed, 14 Oct 2015 19:04:48 -0400 Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga102.jf.intel.com with ESMTP; 14 Oct 2015 16:04:46 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.17,683,1437462000"; d="scan'208";a="793018318" Received: from omniknight.lm.intel.com ([10.232.112.76]) by orsmga001.jf.intel.com with ESMTP; 14 Oct 2015 16:04:45 -0700 From: Vishal Verma To: linux-nvdimm@lists.01.org Cc: linux-acpi@vger.kernel.org, Dan Williams , "Rafael J. Wysocki" , Toshi Kani , Elliott Robert , Vishal Verma Subject: [PATCH v2 1/2] nfit: in acpi_nfit_init, break on a 0-length table Date: Wed, 14 Oct 2015 17:04:25 -0600 Message-Id: <1444863866-19173-2-git-send-email-vishal.l.verma@intel.com> X-Mailer: git-send-email 2.4.3 In-Reply-To: <1444863866-19173-1-git-send-email-vishal.l.verma@intel.com> References: <1444863866-19173-1-git-send-email-vishal.l.verma@intel.com> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, 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 If acpi_nfit_init is called (such as from nfit_test), with an nfit table that has more memory allocated than it needs (and a similarly large 'size' field, add_tables would happily keep adding null SPA Range tables filling up all available memory. Make it friendlier by breaking out if a 0-length header is found in any of the tables. Cc: Dan Williams Cc: Rafael J. Wysocki Cc: Cc: Signed-off-by: Vishal Verma --- drivers/acpi/nfit.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c index c1b8d03..35b4b56 100644 --- a/drivers/acpi/nfit.c +++ b/drivers/acpi/nfit.c @@ -335,6 +335,12 @@ static void *add_table(struct acpi_nfit_desc *acpi_desc, void *table, return NULL; hdr = table; + if (!hdr->length) { + dev_warn(dev, "found a zero length table '%d' parsing nfit\n", + hdr->type); + return NULL; + } + switch (hdr->type) { case ACPI_NFIT_TYPE_SYSTEM_ADDRESS: if (!add_spa(acpi_desc, table))