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=-19.4 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 B2960C4360C for ; Mon, 10 May 2021 10:44:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 858716191D for ; Mon, 10 May 2021 10:44:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231330AbhEJKpw (ORCPT ); Mon, 10 May 2021 06:45:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:48330 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232532AbhEJKhn (ORCPT ); Mon, 10 May 2021 06:37:43 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1A68B61432; Mon, 10 May 2021 10:29:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620642582; bh=B+d/HMwJwK+LTT8jqMhAP0iUKjA1x0huLN614HZVKkE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nhM5nkJn7WTaVdtPwX3LZLI5kLivD71q3a2AcghvYxfJKXK5fvUlfZiNkC6vYcj37 YpYh7nD8/HlyJOpSn5Z6j0iuFYjMrNBMzuR64nQzU8ulEIHwyLc9lJiWSfJ4ezzEvF OFFlasbWL7I45YEY+H326GITzBa2g8DZcRtGHHeE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stefan Berger , Jarkko Sakkinen Subject: [PATCH 5.4 152/184] tpm: vtpm_proxy: Avoid reading host log when using a virtual device Date: Mon, 10 May 2021 12:20:46 +0200 Message-Id: <20210510101955.103862731@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210510101950.200777181@linuxfoundation.org> References: <20210510101950.200777181@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: Stefan Berger commit 9716ac65efc8f780549b03bddf41e60c445d4709 upstream. Avoid allocating memory and reading the host log when a virtual device is used since this log is of no use to that driver. A virtual device can be identified through the flag TPM_CHIP_FLAG_VIRTUAL, which is only set for the tpm_vtpm_proxy driver. Cc: stable@vger.kernel.org Fixes: 6f99612e2500 ("tpm: Proxy driver for supporting multiple emulated TPMs") Signed-off-by: Stefan Berger Reviewed-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen Signed-off-by: Greg Kroah-Hartman --- drivers/char/tpm/eventlog/common.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/char/tpm/eventlog/common.c +++ b/drivers/char/tpm/eventlog/common.c @@ -107,6 +107,9 @@ void tpm_bios_log_setup(struct tpm_chip int log_version; int rc = 0; + if (chip->flags & TPM_CHIP_FLAG_VIRTUAL) + return; + rc = tpm_read_log(chip); if (rc < 0) return;