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 371EDE95A91 for ; Mon, 9 Oct 2023 13:27:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376708AbjJIN07 (ORCPT ); Mon, 9 Oct 2023 09:26:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51734 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376720AbjJIN06 (ORCPT ); Mon, 9 Oct 2023 09:26:58 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 72C71AB for ; Mon, 9 Oct 2023 06:26:57 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B4EACC433C8; Mon, 9 Oct 2023 13:26:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1696858017; bh=m45SfE3lhIJCid1eImSrej8a5GV12LAwUfRiHj6+QJA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KNn+rlwkRafg48xNfS42GCnurDD3CmDvDpgI3A6fFFVzBCduAO14KE0Irm96BJ+TA GwRlbgxqStL2hj2QSCwo4+thRaaDSF8zT1eBdV4t46rf0ho2/7CXuVuLxKTn6rgQBV /6jp2LYfu44xrW9VJ8PROR9wjDesmmuzfqtRHTFU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yu Hao , Zhihao Cheng , Miquel Raynal , Richard Weinberger , Sasha Levin Subject: [PATCH 5.15 29/75] ubi: Refuse attaching if mtds erasesize is 0 Date: Mon, 9 Oct 2023 15:01:51 +0200 Message-ID: <20231009130112.247558710@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231009130111.200710898@linuxfoundation.org> References: <20231009130111.200710898@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhihao Cheng [ Upstream commit 017c73a34a661a861712f7cc1393a123e5b2208c ] There exists mtd devices with zero erasesize, which will trigger a divide-by-zero exception while attaching ubi device. Fix it by refusing attaching if mtd's erasesize is 0. Fixes: 801c135ce73d ("UBI: Unsorted Block Images") Reported-by: Yu Hao Link: https://lore.kernel.org/lkml/977347543.226888.1682011999468.JavaMail.zimbra@nod.at/T/ Signed-off-by: Zhihao Cheng Reviewed-by: Miquel Raynal Signed-off-by: Richard Weinberger Signed-off-by: Sasha Levin --- drivers/mtd/ubi/build.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c index 762dc14aef742..8b247ce73bb6e 100644 --- a/drivers/mtd/ubi/build.c +++ b/drivers/mtd/ubi/build.c @@ -888,6 +888,13 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, return -EINVAL; } + /* UBI cannot work on flashes with zero erasesize. */ + if (!mtd->erasesize) { + pr_err("ubi: refuse attaching mtd%d - zero erasesize flash is not supported\n", + mtd->index); + return -EINVAL; + } + if (ubi_num == UBI_DEV_NUM_AUTO) { /* Search for an empty slot in the @ubi_devices array */ for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++) -- 2.40.1