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Tue, 24 Aug 2021 09:53:21 +0000 Date: Tue, 24 Aug 2021 12:53:09 +0300 From: Dan Carpenter To: almaz.alexandrovich@paragon-software.com Cc: ntfs3@lists.linux.dev Subject: [bug report] fs/ntfs3: Add attrib operations Message-ID: <20210824095309.GA23599@kili> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) X-ClientProxiedBy: ZRAP278CA0013.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:10::23) 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 ZRAP278CA0013.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:10::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4457.17 via Frontend Transport; Tue, 24 Aug 2021 09:53:19 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: ce7834ae-4557-4cd6-88d3-08d966e50180 X-MS-TrafficTypeDiagnostic: MWHPR10MB1246: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:9508; 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827 struct runs_tree *run = &ni->file.run; 828 struct ntfs_sb_info *sbi; 829 u8 cluster_bits; 830 struct ATTRIB *attr = NULL, *attr_b; 831 struct ATTR_LIST_ENTRY *le, *le_b; 832 struct mft_inode *mi, *mi_b; 833 CLST hint, svcn, to_alloc, evcn1, next_svcn, asize, end; 834 u64 total_size; 835 u32 clst_per_frame; 836 bool ok; 837 838 if (new) 839 *new = false; 840 841 down_read(&ni->file.run_lock); 842 ok = run_lookup_entry(run, vcn, lcn, len, NULL); 843 up_read(&ni->file.run_lock); 844 845 if (ok && (*lcn != SPARSE_LCN || !new)) { 846 /* normal way */ 847 return 0; 848 } 849 850 if (!clen) 851 clen = 1; 852 853 if (ok && clen > *len) 854 clen = *len; 855 856 sbi = ni->mi.sbi; 857 cluster_bits = sbi->cluster_bits; 858 859 ni_lock(ni); 860 down_write(&ni->file.run_lock); 861 862 le_b = NULL; 863 attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, 0, NULL, &mi_b); 864 if (!attr_b) { 865 err = -ENOENT; 866 goto out; 867 } 868 869 if (!attr_b->non_res) { 870 *lcn = RESIDENT_LCN; 871 *len = 1; 872 goto out; 873 } 874 875 asize = le64_to_cpu(attr_b->nres.alloc_size) >> sbi->cluster_bits; 876 if (vcn >= asize) { 877 err = -EINVAL; 878 goto out; 879 } 880 881 clst_per_frame = 1u << attr_b->nres.c_unit; --> 882 to_alloc = (clen + clst_per_frame - 1) & ~(clst_per_frame - 1); In this config "clen" is a u64 and "clst_per_frame" is a u32 so this code will truncate to_alloc to a u32. An easy fix is to use the ALIGN() macro. to_alloc = ALIGN(clen, clst_per_frame); However, I still had some questions below so I did not write a patch. 883 884 if (vcn + to_alloc > asize) 885 to_alloc = asize - vcn; If to_alloc is too large for asize then make it smaller. Is it still ALIGNED? 886 887 svcn = le64_to_cpu(attr_b->nres.svcn); 888 evcn1 = le64_to_cpu(attr_b->nres.evcn) + 1; 889 890 attr = attr_b; 891 le = le_b; 892 mi = mi_b; 893 894 if (le_b && (vcn < svcn || evcn1 <= vcn)) { 895 attr = ni_find_attr(ni, attr_b, &le, ATTR_DATA, NULL, 0, &vcn, 896 &mi); 897 if (!attr) { 898 err = -EINVAL; 899 goto out; 900 } 901 svcn = le64_to_cpu(attr->nres.svcn); 902 evcn1 = le64_to_cpu(attr->nres.evcn) + 1; 903 } 904 905 err = attr_load_runs(attr, ni, run, NULL); 906 if (err) 907 goto out; 908 909 if (!ok) { 910 ok = run_lookup_entry(run, vcn, lcn, len, NULL); 911 if (ok && (*lcn != SPARSE_LCN || !new)) { 912 /* normal way */ 913 err = 0; 914 goto ok; 915 } 916 917 if (!ok && !new) { 918 *len = 0; 919 err = 0; 920 goto ok; 921 } 922 923 if (ok && clen > *len) { 924 clen = *len; 925 to_alloc = (clen + clst_per_frame - 1) & 926 ~(clst_per_frame - 1); We re-assign to_alloc here. And it's smaller than before, but it hasn't been checked against asize so it might not be small enough? 927 } 928 } 929 930 if (!is_attr_ext(attr_b)) { 931 err = -EINVAL; 932 goto out; 933 } 934 regards, dan carpenter