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=-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 D9808C4724C for ; Mon, 4 May 2020 17:59:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AF5F12073B for ; Mon, 4 May 2020 17:59:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588615169; bh=oj1aSHJQB2KRe6kNlCB/UO6RMr8tKwXPStULUd2W+Tg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=UGuh5HA7Hoif9+XcJ2JwW/wlLZP+Tqa0zyh4ZM4ZsFOJB0EYsciSMwlGa6v7txn5U ZqrtLn/KGkohDqQsB6vYgM2wqmtIf9CIdTyDukW+B0i0B0gjnDRRgS5NkCuSEIIEHe K21+8dKeqQK/203x3YQgfd/ysTNccbrzPtoty738= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730793AbgEDR72 (ORCPT ); Mon, 4 May 2020 13:59:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:52908 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730767AbgEDR7X (ORCPT ); Mon, 4 May 2020 13:59:23 -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 5ADC220746; Mon, 4 May 2020 17:59:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588615162; bh=oj1aSHJQB2KRe6kNlCB/UO6RMr8tKwXPStULUd2W+Tg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iPtF2xBK+qFHYtRzxZTDLfo50NSZjAprOqFxvAWeWp/ktfTCnH9d8gkBfzrxrGg08 kCKHvk31JwC5VXNigEv8vmPpViKOmTLyen8Ocv0rXwxUEhY0GbDuXaAyKuy86lrkpz d0O2Rt9FB6kKb3Nxx571fvqoxMvWOuMm4y26C8Mw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sunwook Eom , Sami Tolvanen , Mike Snitzer Subject: [PATCH 4.9 10/18] dm verity fec: fix hash block number in verity_fec_decode Date: Mon, 4 May 2020 19:57:20 +0200 Message-Id: <20200504165444.248614958@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200504165442.028485341@linuxfoundation.org> References: <20200504165442.028485341@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sunwook Eom commit ad4e80a639fc61d5ecebb03caa5cdbfb91fcebfc upstream. The error correction data is computed as if data and hash blocks were concatenated. But hash block number starts from v->hash_start. So, we have to calculate hash block number based on that. Fixes: a739ff3f543af ("dm verity: add support for forward error correction") Cc: stable@vger.kernel.org Signed-off-by: Sunwook Eom Reviewed-by: Sami Tolvanen Signed-off-by: Mike Snitzer Signed-off-by: Greg Kroah-Hartman --- drivers/md/dm-verity-fec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/md/dm-verity-fec.c +++ b/drivers/md/dm-verity-fec.c @@ -447,7 +447,7 @@ int verity_fec_decode(struct dm_verity * fio->level++; if (type == DM_VERITY_BLOCK_TYPE_METADATA) - block += v->data_blocks; + block = block - v->hash_start + v->data_blocks; /* * For RS(M, N), the continuous FEC data is divided into blocks of N