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=-11.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 8D0E7C4363A for ; Mon, 26 Oct 2020 16:37:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3EC13223B0 for ; Mon, 26 Oct 2020 16:37:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1786139AbgJZQhY (ORCPT ); Mon, 26 Oct 2020 12:37:24 -0400 Received: from mx2.suse.de ([195.135.220.15]:60662 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1738342AbgJZQhW (ORCPT ); Mon, 26 Oct 2020 12:37:22 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 12AF3AD52; Mon, 26 Oct 2020 16:37:21 +0000 (UTC) Received: by ds.suse.cz (Postfix, from userid 10065) id 07BA3DA6E2; Mon, 26 Oct 2020 17:35:46 +0100 (CET) Date: Mon, 26 Oct 2020 17:35:46 +0100 From: David Sterba To: "Matthew Wilcox (Oracle)" Cc: linux-fsdevel@vger.kernel.org, ericvh@gmail.com, lucho@ionkov.net, viro@zeniv.linux.org.uk, jlayton@kernel.org, idryomov@gmail.com, mark@fasheh.com, jlbec@evilplan.org, joseph.qi@linux.alibaba.com, v9fs-developer@lists.sourceforge.net, linux-kernel@vger.kernel.org, ceph-devel@vger.kernel.org, ocfs2-devel@oss.oracle.com, linux-btrfs@vger.kernel.org, clm@fb.com, josef@toxicpanda.com, dsterba@suse.com, stable@vger.kernel.org Subject: Re: [PATCH 6/7] btrfs: Promote to unsigned long long before shifting Message-ID: <20201026163546.GP6756@twin.jikos.cz> Reply-To: dsterba@suse.cz Mail-Followup-To: dsterba@suse.cz, "Matthew Wilcox (Oracle)" , linux-fsdevel@vger.kernel.org, ericvh@gmail.com, lucho@ionkov.net, viro@zeniv.linux.org.uk, jlayton@kernel.org, idryomov@gmail.com, mark@fasheh.com, jlbec@evilplan.org, joseph.qi@linux.alibaba.com, v9fs-developer@lists.sourceforge.net, linux-kernel@vger.kernel.org, ceph-devel@vger.kernel.org, ocfs2-devel@oss.oracle.com, linux-btrfs@vger.kernel.org, clm@fb.com, josef@toxicpanda.com, dsterba@suse.com, stable@vger.kernel.org References: <20201004180428.14494-1-willy@infradead.org> <20201004180428.14494-7-willy@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201004180428.14494-7-willy@infradead.org> User-Agent: Mutt/1.5.23.1-rc1 (2014-03-12) Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Sun, Oct 04, 2020 at 07:04:27PM +0100, Matthew Wilcox (Oracle) wrote: > On 32-bit systems, this shift will overflow for files larger than 4GB. > > Cc: stable@vger.kernel.org > Fixes: 53b381b3abeb ("Btrfs: RAID5 and RAID6") > Signed-off-by: Matthew Wilcox (Oracle) > --- > fs/btrfs/raid56.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c > index 255490f42b5d..5ee0a53301bd 100644 > --- a/fs/btrfs/raid56.c > +++ b/fs/btrfs/raid56.c > @@ -1089,7 +1089,7 @@ static int rbio_add_io_page(struct btrfs_raid_bio *rbio, > u64 disk_start; > > stripe = &rbio->bbio->stripes[stripe_nr]; > - disk_start = stripe->physical + (page_index << PAGE_SHIFT); > + disk_start = stripe->physical + ((loff_t)page_index << PAGE_SHIFT); It seems that this patch is mechanical replacement. If you check the callers, the page_index is passed from an int that iterates over bits set in an unsigned long (bitmap). The result won't overflow.