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=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 3FB58C33CB1 for ; Tue, 14 Jan 2020 11:38:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 07EEE2467A for ; Tue, 14 Jan 2020 11:38:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alien8.de header.i=@alien8.de header.b="dmWY2t71" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729536AbgANLin (ORCPT ); Tue, 14 Jan 2020 06:38:43 -0500 Received: from mail.skyhub.de ([5.9.137.197]:40912 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725956AbgANLin (ORCPT ); Tue, 14 Jan 2020 06:38:43 -0500 Received: from zn.tnic (p200300EC2F0C770060129B71B11B0F90.dip0.t-ipconnect.de [IPv6:2003:ec:2f0c:7700:6012:9b71:b11b:f90]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id AFC731EC0BEA; Tue, 14 Jan 2020 12:38:41 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1579001921; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=MUxEvzo2qOemIqNZH2imAAMYdLRr9L+RyhB34mILxjs=; b=dmWY2t71WvR+w3m6aakJhQ2w+9wqoNGUKdGQT53gxHyRk50vwDiH9vjYFjS9wUkBZnrRZk h+zdx6nwfhpiiom8pDqjrhWrzwTVkR1cEnFH1dVAAf7qs1+BUMICayIAIRnMjxhnlJubqx xCgtREbsMHspWtdukCfdDAhVIFIkBW4= Date: Tue, 14 Jan 2020 12:38:34 +0100 From: Borislav Petkov To: Colin King Cc: Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , x86@kernel.org, kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] x86/microcode/amd: fix uninitalized structure cp Message-ID: <20200114113834.GE31032@zn.tnic> References: <20200114111505.320186-1-colin.king@canonical.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20200114111505.320186-1-colin.king@canonical.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jan 14, 2020 at 11:15:05AM +0000, Colin King wrote: > From: Colin Ian King > > In the case where cp is not assigned to the return from > the call to find_microcode_in_initrd Where does this happen? I don't see it. > cp is uninitialized when > it is assigned to *ret. Functions that call __load_ucode_amd > such as load_ucode_amd_bsp can therefore end up checking bogus > values cp.data and cp.size. Fix this by ensuring cp is > initialized as all zero and remove the redundant initialization > of cp in load_ucode_amd_bsp. > > Addresses-Coverity: ("Uninitialized scalar variable") I already asked about those: either document what those tags mean or remove them. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette