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Tue, 24 Aug 2021 11:39:12 +0000 Date: Tue, 24 Aug 2021 14:39:01 +0300 From: Dan Carpenter To: almaz.alexandrovich@paragon-software.com Cc: ntfs3@lists.linux.dev Subject: [bug report] fs/ntfs3: mask truncates in ntfs_compress_write() Message-ID: <20210824113901.GB31143@kili> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) X-ClientProxiedBy: ZR0P278CA0121.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:20::18) To MWHPR1001MB2365.namprd10.prod.outlook.com (2603:10b6:301:2d::28) Precedence: bulk X-Mailing-List: ntfs3@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from kili (62.8.83.99) by ZR0P278CA0121.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:20::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4436.19 via Frontend Transport; Tue, 24 Aug 2021 11:39:10 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: e0a43185-6cba-4925-c557-08d966f3cae9 X-MS-TrafficTypeDiagnostic: MWHPR10MB1822: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:2887; 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874 struct file *file = iocb->ki_filp; 875 size_t count = iov_iter_count(from); 876 loff_t pos = iocb->ki_pos; 877 struct inode *inode = file_inode(file); 878 loff_t i_size = inode->i_size; 879 struct address_space *mapping = inode->i_mapping; 880 struct ntfs_inode *ni = ntfs_i(inode); 881 u64 valid = ni->i_valid; 882 struct ntfs_sb_info *sbi = ni->mi.sbi; 883 struct page *page, **pages = NULL; 884 size_t written = 0; 885 u8 frame_bits = NTFS_LZNT_CUNIT + sbi->cluster_bits; 886 u32 frame_size = 1u << frame_bits; 887 u32 pages_per_frame = frame_size >> PAGE_SHIFT; 888 u32 ip, off; 889 CLST frame; 890 u64 frame_vbo; 891 pgoff_t index; 892 bool frame_uptodate; 893 894 if (frame_size < PAGE_SIZE) { 895 /* 896 * frame_size == 8K if cluster 512 897 * frame_size == 64K if cluster 4096 898 */ 899 ntfs_inode_warn(inode, "page size is bigger than frame size"); 900 return -EOPNOTSUPP; 901 } 902 903 pages = ntfs_malloc(pages_per_frame * sizeof(struct page *)); 904 if (!pages) 905 return -ENOMEM; 906 907 current->backing_dev_info = inode_to_bdi(inode); 908 err = file_remove_privs(file); 909 if (err) 910 goto out; 911 912 err = file_update_time(file); 913 if (err) 914 goto out; 915 916 /* zero range [valid : pos) */ 917 while (valid < pos) { 918 CLST lcn, clen; 919 920 frame = valid >> frame_bits; --> 921 frame_vbo = valid & ~(frame_size - 1); valid is u64 but the mask truncates to u32. 922 off = valid & (frame_size - 1); 923 924 err = attr_data_get_block(ni, frame << NTFS_LZNT_CUNIT, 0, &lcn, 925 &clen, NULL); 926 if (err) regards, dan carpenter