From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754070AbeDJOXt (ORCPT ); Tue, 10 Apr 2018 10:23:49 -0400 Received: from aserp2130.oracle.com ([141.146.126.79]:56576 "EHLO aserp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753845AbeDJOXq (ORCPT ); Tue, 10 Apr 2018 10:23:46 -0400 Date: Tue, 10 Apr 2018 17:22:53 +0300 From: Dan Carpenter To: Colin King Cc: Borislav Petkov , 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 read of uninitialized data Message-ID: <20180410142252.crnlqkia2pmucbum@mwanda> References: <20180410134123.13832-1-colin.king@canonical.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180410134123.13832-1-colin.king@canonical.com> User-Agent: NeoMutt/20170609 (1.8.3) X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8858 signatures=668698 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=324 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1711220000 definitions=main-1804100142 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 10, 2018 at 02:41:23PM +0100, Colin King wrote: > From: Colin Ian King > > Currently function __load_ucode_amd can assign an uninitialized cp to *ret > if get_builtin_microcode returns false. What are you looking at? Here is how it looks in linux-next: 270 271 if (!get_builtin_microcode(&cp, x86_family(cpuid_1_eax))) 272 cp = find_microcode_in_initrd(path, use_pa); 273 If get_builtin_microcode() returns false, then cp is initialized on the next line. Maybe the issue is that cp.name is uninitialized. It doesn't cause an issue but it would be understandable for a static checker to warn about it when we do "*ret = cp;". regards, dan carpenter