From patchwork Thu Apr 16 13:23:57 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 227600 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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 C41FDC2BB85 for ; Thu, 16 Apr 2020 15:37:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9CD63214AF for ; Thu, 16 Apr 2020 15:37:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587051446; bh=9dyaT9wnAWhQSKmAiJwAuMsv2hIYneiLsOUo5frnMTc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=lAnvGfDA/GySvpaFvvBesZOOwfjnMUDAw7i2Gy7AxnjakfF9EAs2IEkHT0Uy99bGK 2YThMciG5O6k1QV8DKpqEPhlHOmWl1yH+d1DqS1vBfANb5eXoot63TjCleZjaKRWT1 JHH+C2TSrLen6T7tnC0rQVA5+6zy8GvRm5kL+Z4s= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2897954AbgDPNjZ (ORCPT ); Thu, 16 Apr 2020 09:39:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:51712 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2897943AbgDPNjV (ORCPT ); Thu, 16 Apr 2020 09:39:21 -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 355272063A; Thu, 16 Apr 2020 13:39:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587044360; bh=9dyaT9wnAWhQSKmAiJwAuMsv2hIYneiLsOUo5frnMTc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=q3AtTKOOcI0g0c6D/On/Sj2muOcAVdg0kFfap/rtkIp5D3Of9WbNpq0eWjmiFWbAW oslhASLUXUqPGBwiH0Xr5+wdADpndPzOQ7RmE7nctnv0ODEEpH3zaEJ784iwceh1cE C7P1Itv3W81dKOB+iWS6rPKLts3y5kawjtklakv8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nikos Tsironis , Mike Snitzer Subject: [PATCH 5.5 186/257] dm clone: Add missing casts to prevent overflows and data corruption Date: Thu, 16 Apr 2020 15:23:57 +0200 Message-Id: <20200416131349.554357030@linuxfoundation.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200416131325.891903893@linuxfoundation.org> References: <20200416131325.891903893@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 commit 9fc06ff56845cc5ccafec52f545fc2e08d22f849 upstream. 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: Greg Kroah-Hartman --- drivers/md/dm-clone-target.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) --- a/drivers/md/dm-clone-target.c +++ b/drivers/md/dm-clone-target.c @@ -282,7 +282,7 @@ static bool bio_triggers_commit(struct c /* 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 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 @@ -804,11 +804,14 @@ static void hydration_copy(struct dm_clo 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) { /*