From patchwork Mon Mar 1 16:11:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 390244 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=ham 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 76AFDC433E6 for ; Mon, 1 Mar 2021 16:30:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 38EC664F4D for ; Mon, 1 Mar 2021 16:30:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234729AbhCAQ2r (ORCPT ); Mon, 1 Mar 2021 11:28:47 -0500 Received: from mail.kernel.org ([198.145.29.99]:59972 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237848AbhCAQYV (ORCPT ); Mon, 1 Mar 2021 11:24:21 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 2480764F3E; Mon, 1 Mar 2021 16:21:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614615676; bh=OZF7VyPZXF1k+HyKccLEAUYuA12AE4l7p/jHgBmKTpE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rESyObtyn2Pv0+KMiIFDZr7rPFbsRiWwLJV7kpuIFCCSeziCOh3dHJLbG1Myo5lBJ UIZBDnGZ/wjS7aunubG/uccvRrAtaWs2d3K7NkmblyAtW/NFy0JrrWmC9rkYUXNcVX FXIqhLKc29+oIhpZm3QA7YsJ5pzJkQ3FGCCaL2Pw= 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 4.9 003/134] ntfs: check for valid standard information attribute Date: Mon, 1 Mar 2021 17:11:44 +0100 Message-Id: <20210301161013.751727028@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161013.585393984@linuxfoundation.org> References: <20210301161013.585393984@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@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 @@ -661,6 +661,12 @@ 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));