From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2DE52C433EB for ; Mon, 29 Mar 2021 08:20:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 19B516044F for ; Mon, 29 Mar 2021 08:20:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233397AbhC2IUH (ORCPT ); Mon, 29 Mar 2021 04:20:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:56030 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232833AbhC2IMR (ORCPT ); Mon, 29 Mar 2021 04:12:17 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3EA3061494; Mon, 29 Mar 2021 08:12:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1617005534; bh=vYyV+kBM1TPUs8JBk1N7OqBCX71hPx7lrnMzeArP0hE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qY3dopbh1YadM8r9Y/xgyWhovm6r0HLgMs4nGJ5H7/iHa7Dx3rxVoVuypdvv/h+0a LqKfVRhLlCedsII/BBYlhHPym4K912BI8pIgcH4Mk+VfRLc2U8ze4mQcu/gwGmseVY MXBLqCHKEltPouECSmYKeGcBCgLIgHEQgZT4MX0Y= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Philipp Leskovitz , Mark Pearson , Pierre-Louis Bossart , Takashi Iwai , Sasha Levin Subject: [PATCH 5.4 007/111] ALSA: hda: ignore invalid NHLT table Date: Mon, 29 Mar 2021 09:57:15 +0200 Message-Id: <20210329075615.442283373@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210329075615.186199980@linuxfoundation.org> References: <20210329075615.186199980@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mark Pearson [ Upstream commit a14a6219996ee6f6e858d83b11affc7907633687 ] On some Lenovo systems if the microphone is disabled in the BIOS only the NHLT table header is created, with no data. This means the endpoints field is not correctly set to zero - leading to an unintialised variable and hence invalid descriptors are parsed leading to page faults. The Lenovo firmware team is addressing this, but adding a check preventing invalid tables being parsed is worthwhile. Tested on a Lenovo T14. Tested-by: Philipp Leskovitz Reported-by: Philipp Leskovitz Signed-off-by: Mark Pearson Reviewed-by: Pierre-Louis Bossart Link: https://lore.kernel.org/r/20210302141003.7342-1-markpearson@lenovo.com Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/hda/intel-nhlt.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/sound/hda/intel-nhlt.c b/sound/hda/intel-nhlt.c index baeda6c9716a..6ed80a4cba01 100644 --- a/sound/hda/intel-nhlt.c +++ b/sound/hda/intel-nhlt.c @@ -72,6 +72,11 @@ int intel_nhlt_get_dmic_geo(struct device *dev, struct nhlt_acpi_table *nhlt) if (!nhlt) return 0; + if (nhlt->header.length <= sizeof(struct acpi_table_header)) { + dev_warn(dev, "Invalid DMIC description table\n"); + return 0; + } + for (j = 0, epnt = nhlt->desc; j < nhlt->endpoint_count; j++, epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length)) { -- 2.30.1