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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 612C5C4708D for ; Wed, 4 Jan 2023 14:55:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235246AbjADOzp (ORCPT ); Wed, 4 Jan 2023 09:55:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44678 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236020AbjADOzi (ORCPT ); Wed, 4 Jan 2023 09:55:38 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8512A1EEC3; Wed, 4 Jan 2023 06:55:37 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 3869CB8169D; Wed, 4 Jan 2023 14:55:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 64B76C433F0; Wed, 4 Jan 2023 14:55:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1672844134; bh=zwF9T2z5L044ggy5j+5rYTatc9avuUbCH+Aw6bOhtFs=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=szIP0Hr7BqLslgfZBQLFYOHb4HjlQ1udMsGC8m19ZnM0dkAO6sqNgCIJsYSoemi2x XvPOWn93w1b7RUKQ7aqoqhOIRBNemu8X9SwbtwVRX+Ig6ju9lCf7rdCMaSNf4/Jnyu n9BBVL+qOmeXJRkhKLlFLsoE/w9GKWKUGyYOr2D4= Date: Wed, 4 Jan 2023 15:48:11 +0100 From: Greg KH To: Alex Deucher Cc: Christian =?iso-8859-1?Q?K=F6nig?= , Dragos-Marian Panait , Oded Gabbay , David Zhou , amd-gfx@lists.freedesktop.org, David Airlie , Felix Kuehling , Jiasheng Jiang , linux-kernel@vger.kernel.org, stable@vger.kernel.org, dri-devel@lists.freedesktop.org, Alex Deucher Subject: Re: [PATCH 4.19 1/1] drm/amdkfd: Check for null pointer after calling kmemdup Message-ID: References: <20230103184308.511448-1-dragos.panait@windriver.com> <20230103184308.511448-2-dragos.panait@windriver.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jan 04, 2023 at 09:35:03AM -0500, Alex Deucher wrote: > On Wed, Jan 4, 2023 at 8:23 AM Christian König wrote: > > > > Am 04.01.23 um 13:41 schrieb Greg KH: > > > On Tue, Jan 03, 2023 at 08:43:08PM +0200, Dragos-Marian Panait wrote: > > >> From: Jiasheng Jiang > > >> > > >> [ Upstream commit abfaf0eee97925905e742aa3b0b72e04a918fa9e ] > > >> > > >> As the possible failure of the allocation, kmemdup() may return NULL > > >> pointer. > > >> Therefore, it should be better to check the 'props2' in order to prevent > > >> the dereference of NULL pointer. > > >> > > >> Fixes: 3a87177eb141 ("drm/amdkfd: Add topology support for dGPUs") > > >> Signed-off-by: Jiasheng Jiang > > >> Reviewed-by: Felix Kuehling > > >> Signed-off-by: Felix Kuehling > > >> Signed-off-by: Alex Deucher > > >> Signed-off-by: Dragos-Marian Panait > > >> --- > > >> drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 3 +++ > > >> 1 file changed, 3 insertions(+) > > > For obvious reasons, I can't take a patch for 4.19.y and not newer > > > kernel releases, right? > > > > > > Please provide backports for all kernels if you really need to see this > > > merged. And note, it's not a real bug at all, and given that a CVE was > > > allocated for it that makes me want to even more reject it to show the > > > whole folly of that mess. > > > > Well as far as I can see this is nonsense to back port. > > > > The code in question is only used only once during driver load and then > > never again, that exactly this allocation fails while tons of other are > > made before and after is extremely unlikely. > > > > It's nice to have it fixed in newer kernels, but not worth a backport > > and certainly not stuff for a CVE. > > It's already fixed in Linus' tree: > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=abfaf0eee97925905e742aa3b0b72e04a918fa9e Yes, that's what the above commit shows... confused, greg k-h