From patchwork Thu Apr 16 13:25:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 227821 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 2C5BDC3815B for ; Thu, 16 Apr 2020 13:51:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0A53E2078B for ; Thu, 16 Apr 2020 13:51:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587045118; bh=JQdnDdhYv6d4tDD+A98SpEPRKFhhAozHc0eClzQz76w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=uEbl0UUrkJf7En0HkSgDWSNlKIKcfa/S+0DsDUU6zq8sSzrvcdaospmXOXR2/dlnE 6nmcvZfm3dXqDZncK5Ok4aT1UOJTsdQeQ8LC0nxoty7AozZya88WBpvqwQMxQOELQv t227p7N5D7mePF6YSkvUUG59WrhLWTy60uT4JywA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2408779AbgDPNvz (ORCPT ); Thu, 16 Apr 2020 09:51:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:38070 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2408772AbgDPNvw (ORCPT ); Thu, 16 Apr 2020 09:51:52 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 77537221F7; Thu, 16 Apr 2020 13:51:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587045111; bh=JQdnDdhYv6d4tDD+A98SpEPRKFhhAozHc0eClzQz76w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0+Tx1t1Mvdd+BCeuTf8tjgnE7ujSfF89hQbypw406ZaCBx1DMI7t7e3SS4SN8+70C qgGAld7PN4l7YDEMpgKFywNowrvKQY+Q5bRzU/lHO7JMw2HFsVWqqdpzHDM8tZ2ahZ +0l2Mg+YKbUW/frcQmWA8jBWqdjxQlSezOzcQmXQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nikos Tsironis , Mike Snitzer , Sasha Levin Subject: [PATCH 5.4 221/232] dm clone: Add missing casts to prevent overflows and data corruption Date: Thu, 16 Apr 2020 15:25:15 +0200 Message-Id: <20200416131343.129739576@linuxfoundation.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200416131316.640996080@linuxfoundation.org> References: <20200416131316.640996080@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Nikos Tsironis [ Upstream commit 9fc06ff56845cc5ccafec52f545fc2e08d22f849 ] Add missing casts when converting from regions to sectors. In case BITS_PER_LONG == 32, the lack of the appropriate casts can lead to overflows and miscalculation of the device sector. As a result, we could end up discarding and/or copying the wrong parts of the device, thus corrupting the device's data. Fixes: 7431b7835f55 ("dm: add clone target") Cc: stable@vger.kernel.org # v5.4+ Signed-off-by: Nikos Tsironis Signed-off-by: Mike Snitzer Signed-off-by: Sasha Levin --- drivers/md/dm-clone-target.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/md/dm-clone-target.c b/drivers/md/dm-clone-target.c index 315d3bca59792..eb7a5d3ba81a2 100644 --- a/drivers/md/dm-clone-target.c +++ b/drivers/md/dm-clone-target.c @@ -282,7 +282,7 @@ static bool bio_triggers_commit(struct clone *clone, struct bio *bio) /* Get the address of the region in sectors */ static inline sector_t region_to_sector(struct clone *clone, unsigned long region_nr) { - return (region_nr << clone->region_shift); + return ((sector_t)region_nr << clone->region_shift); } /* Get the region number of the bio */ @@ -471,7 +471,7 @@ static void complete_discard_bio(struct clone *clone, struct bio *bio, bool succ if (test_bit(DM_CLONE_DISCARD_PASSDOWN, &clone->flags) && success) { remap_to_dest(clone, bio); bio_region_range(clone, bio, &rs, &nr_regions); - trim_bio(bio, rs << clone->region_shift, + trim_bio(bio, region_to_sector(clone, rs), nr_regions << clone->region_shift); generic_make_request(bio); } else @@ -798,11 +798,14 @@ static void hydration_copy(struct dm_clone_region_hydration *hd, unsigned int nr struct dm_io_region from, to; struct clone *clone = hd->clone; + if (WARN_ON(!nr_regions)) + return; + region_size = clone->region_size; region_start = hd->region_nr; region_end = region_start + nr_regions - 1; - total_size = (nr_regions - 1) << clone->region_shift; + total_size = region_to_sector(clone, nr_regions - 1); if (region_end == clone->nr_regions - 1) { /*