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=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 4E6B7C433E9 for ; Wed, 17 Mar 2021 00:57:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0D3FA64FAB for ; Wed, 17 Mar 2021 00:57:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229847AbhCQA4b (ORCPT ); Tue, 16 Mar 2021 20:56:31 -0400 Received: from mail.kernel.org ([198.145.29.99]:60906 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229851AbhCQAzs (ORCPT ); Tue, 16 Mar 2021 20:55:48 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7EF2264F8C; Wed, 17 Mar 2021 00:55:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1615942548; bh=8lIR2o4v18WR/2YlHYIn96RC4k9ZocX631GO7STRiBc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QzVAUuj68j1wv13I6kZoYqbz+0WoFQfQWjwufMboy+QlEoBYo392BQUdURQKF3Efl tW9+7mIZMHQO6EkvUDT6eKCV48VjptWgJJ4wecRBrvej/l6b9DWrqPU5SaD16wdbYM tl40plS0XfTzODoDvaZA/2axlH57nPtOie0FVYsbUi4a4q90kr+z6A04BJxYAvYoHj yE8nVQkXBxGEwkv4DZNyPgRDO8R82hmfKX1Yj3hkSzS5C0Gj3mccr3PuYeJOAmcpun apb54EmTquyptKtKi/OOHK8JskYwYDi7LDf4CiQFxdtzt71StFV51RrKnicw/1DZGh clX3mN89y3g/w== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Mark Pearson , Philipp Leskovitz , Pierre-Louis Bossart , Takashi Iwai , Sasha Levin , alsa-devel@alsa-project.org Subject: [PATCH AUTOSEL 5.11 09/61] ALSA: hda: ignore invalid NHLT table Date: Tue, 16 Mar 2021 20:54:43 -0400 Message-Id: <20210317005536.724046-9-sashal@kernel.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210317005536.724046-1-sashal@kernel.org> References: <20210317005536.724046-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore 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 d053beccfaec..e2237239d922 100644 --- a/sound/hda/intel-nhlt.c +++ b/sound/hda/intel-nhlt.c @@ -39,6 +39,11 @@ 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