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 948EB653; Tue, 23 Jan 2024 00:03:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705968203; cv=none; b=gLac16HZFjegUl9wbNkK1mHhqRpzb/x7WkoubP5M05eqeqe1YRjZj/xVsjIygdQ/kXcURFRz3seso7oqbso+D5VsFVrEiX393Yi+akiDCsFitWauvSOfE62+i/kdqiHxq/VdtyMxV3WIxe0N7j9sIelYUwzhO02bNeev/yoEEjE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705968203; c=relaxed/simple; bh=14Mpy9no3CerKOV5PpWYWMbUS4ApTV+xIaUF0ksxwMM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=gfUiwE2K5mcHNuA3oIYksAO5tbjAS8D8V6a7N+KWv7wq+nJXetdSYwunz60ZwsJ5INCEWYoPDp1mAd5GE1laj0fy7YIaM2XfMCj2VysMLYj8F1513ARnHCTzYuJBp42VCmK7pbR2bYAbi8Un70mE7dfH1TyqUG269OrKFRmbx30= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Qt96wzYU; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Qt96wzYU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E7538C43394; Tue, 23 Jan 2024 00:03:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1705968203; bh=14Mpy9no3CerKOV5PpWYWMbUS4ApTV+xIaUF0ksxwMM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Qt96wzYU6+6tbvFevl7+iDLp9QYQgOO5aV5+xqOwsagFWZiD6EDG9/VH45toABE43 9+Lp89lTkToxdjRo406YVR20zwSTyX/od3SZEluNV6NHVxmP5bYhKi/InmO9IP+213 dlkR9Zub8iI2+tT4RpKIVimbMcdweezHPaO4wjYo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, ZhaoLong Wang , Zhihao Cheng , Richard Weinberger , Miquel Raynal , Sasha Levin Subject: [PATCH 4.19 043/148] mtd: Fix gluebi NULL pointer dereference caused by ftl notifier Date: Mon, 22 Jan 2024 15:56:39 -0800 Message-ID: <20240122235714.146848250@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240122235712.442097787@linuxfoundation.org> References: <20240122235712.442097787@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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: ZhaoLong Wang [ Upstream commit a43bdc376deab5fff1ceb93dca55bcab8dbdc1d6 ] If both ftl.ko and gluebi.ko are loaded, the notifier of ftl triggers NULL pointer dereference when trying to access ‘gluebi->desc’ in gluebi_read(). ubi_gluebi_init ubi_register_volume_notifier ubi_enumerate_volumes ubi_notify_all gluebi_notify nb->notifier_call() gluebi_create mtd_device_register mtd_device_parse_register add_mtd_device blktrans_notify_add not->add() ftl_add_mtd tr->add_mtd() scan_header mtd_read mtd_read_oob mtd_read_oob_std gluebi_read mtd->read() gluebi->desc - NULL Detailed reproduction information available at the Link [1], In the normal case, obtain gluebi->desc in the gluebi_get_device(), and access gluebi->desc in the gluebi_read(). However, gluebi_get_device() is not executed in advance in the ftl_add_mtd() process, which leads to NULL pointer dereference. The solution for the gluebi module is to run jffs2 on the UBI volume without considering working with ftl or mtdblock [2]. Therefore, this problem can be avoided by preventing gluebi from creating the mtdblock device after creating mtd partition of the type MTD_UBIVOLUME. Fixes: 2ba3d76a1e29 ("UBI: make gluebi a separate module") Link: https://bugzilla.kernel.org/show_bug.cgi?id=217992 [1] Link: https://lore.kernel.org/lkml/441107100.23734.1697904580252.JavaMail.zimbra@nod.at/ [2] Signed-off-by: ZhaoLong Wang Reviewed-by: Zhihao Cheng Acked-by: Richard Weinberger Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20231220024619.2138625-1-wangzhaolong1@huawei.com Signed-off-by: Sasha Levin --- drivers/mtd/mtd_blkdevs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c index 6a41dfa3c36b..a9aa1b518d81 100644 --- a/drivers/mtd/mtd_blkdevs.c +++ b/drivers/mtd/mtd_blkdevs.c @@ -521,7 +521,7 @@ static void blktrans_notify_add(struct mtd_info *mtd) { struct mtd_blktrans_ops *tr; - if (mtd->type == MTD_ABSENT) + if (mtd->type == MTD_ABSENT || mtd->type == MTD_UBIVOLUME) return; list_for_each_entry(tr, &blktrans_majors, list) @@ -564,7 +564,7 @@ int register_mtd_blktrans(struct mtd_blktrans_ops *tr) list_add(&tr->list, &blktrans_majors); mtd_for_each_device(mtd) - if (mtd->type != MTD_ABSENT) + if (mtd->type != MTD_ABSENT && mtd->type != MTD_UBIVOLUME) tr->add_mtd(tr, mtd); mutex_unlock(&mtd_table_mutex); -- 2.43.0