From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BABD6328DB for ; Mon, 9 Oct 2023 13:45:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ive980z1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 355D8C433C8; Mon, 9 Oct 2023 13:45:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1696859146; bh=tShjwuyCckBcrUTehFdkOCcfS7zi0pWls8kVlSJl6z8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ive980z1bYRRiiwJ4hIFlMF6+JInVN/yLTCC57/xVP3J4Yjsx24ltdiOgyI/d4SI9 20tgcQH6scqrqcH+hESVJcnsF96h6keficC3OW5lopuHywLdpxAuvAZM+pztkePz3+ SH2oNBkG9ZytAEvia9qGJuyv1hcH7j+026enbuvA= 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 5.10 186/226] ubi: Refuse attaching if mtds erasesize is 0 Date: Mon, 9 Oct 2023 15:02:27 +0200 Message-ID: <20231009130131.483401754@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231009130126.697995596@linuxfoundation.org> References: <20231009130126.697995596@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.10-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 929ce489b0629..c689bed646287 100644 --- a/drivers/mtd/ubi/build.c +++ b/drivers/mtd/ubi/build.c @@ -889,6 +889,13 @@ 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