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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 5C3F6C282E0 for ; Mon, 1 Mar 2021 19:59:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 336E264DDE for ; Mon, 1 Mar 2021 19:59:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242546AbhCAT6e (ORCPT ); Mon, 1 Mar 2021 14:58:34 -0500 Received: from mail.kernel.org ([198.145.29.99]:59150 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236122AbhCAQ6K (ORCPT ); Mon, 1 Mar 2021 11:58:10 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8D0BD64F5A; Mon, 1 Mar 2021 16:36:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614616585; bh=r/akzR047z3giKvarUyMXMxiaP4ebxAXYihbJubkWHU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IdtPu6zoBywYjcqoyBUqNITr0eRlQ0a5OcpH9edNLTxBbZOrYyHoRlW+jMVH9Ryfh kobqP2eHoqkcvrig3rNQ2A0QU6zX7DfP9n7Bhdef0syKCPRWqOrFW87bKc8U1TuAXZ WP6zJ9shdsYRmb/gV4S/qIMoEH32KUcE12kqd73Y= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Rustam Kovhaev , syzbot+c584225dabdea2f71969@syzkaller.appspotmail.com, Anton Altaparmakov , Andrew Morton , Linus Torvalds Subject: [PATCH 4.19 004/247] ntfs: check for valid standard information attribute Date: Mon, 1 Mar 2021 17:10:24 +0100 Message-Id: <20210301161031.905298809@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161031.684018251@linuxfoundation.org> References: <20210301161031.684018251@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rustam Kovhaev commit 4dfe6bd94959222e18d512bdf15f6bf9edb9c27c upstream. Mounting a corrupted filesystem with NTFS resulted in a kernel crash. We should check for valid STANDARD_INFORMATION attribute offset and length before trying to access it Link: https://lkml.kernel.org/r/20210217155930.1506815-1-rkovhaev@gmail.com Link: https://syzkaller.appspot.com/bug?extid=c584225dabdea2f71969 Signed-off-by: Rustam Kovhaev Reported-by: syzbot+c584225dabdea2f71969@syzkaller.appspotmail.com Tested-by: syzbot+c584225dabdea2f71969@syzkaller.appspotmail.com Acked-by: Anton Altaparmakov Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- fs/ntfs/inode.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/fs/ntfs/inode.c +++ b/fs/ntfs/inode.c @@ -654,6 +654,12 @@ static int ntfs_read_locked_inode(struct } a = ctx->attr; /* Get the standard information attribute value. */ + if ((u8 *)a + le16_to_cpu(a->data.resident.value_offset) + + le32_to_cpu(a->data.resident.value_length) > + (u8 *)ctx->mrec + vol->mft_record_size) { + ntfs_error(vi->i_sb, "Corrupt standard information attribute in inode."); + goto unm_err_out; + } si = (STANDARD_INFORMATION*)((u8*)a + le16_to_cpu(a->data.resident.value_offset));