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Tue, 24 Aug 2021 09:03:05 +0000 Date: Tue, 24 Aug 2021 12:02:55 +0300 From: Dan Carpenter To: almaz.alexandrovich@paragon-software.com Cc: ntfs3@lists.linux.dev Subject: [bug report] fs/ntfs3: Add file operations and implementation Message-ID: <20210824090255.GA18518@kili> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) X-ClientProxiedBy: ZR0P278CA0126.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:20::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 ZR0P278CA0126.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:20::23) 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 09:03:03 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 260f75a3-0049-44e8-7690-08d966ddfbff X-MS-TrafficTypeDiagnostic: CO1PR10MB4707: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:2043; 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The patch 4342306f0f0d: "fs/ntfs3: Add file operations and implementation" from Aug 13, 2021, leads to the following Smatch complaint: fs/ntfs3/namei.c:446 ntfs_rename() warn: variable dereferenced before check 'old_inode' (see line 312) fs/ntfs3/namei.c 311 312 if (ntfs_is_meta_file(sbi, old_inode->i_ino)) { ^^^^^^^^^^^^^^^^ Dereference 313 err = -EINVAL; 314 goto out; 315 } 316 317 if (new_inode) { 318 /*target name exists. unlink it*/ 319 dget(new_dentry); 320 ni_lock_dir(new_dir_ni); 321 err = ntfs_unlink_inode(new_dir, new_dentry); 322 ni_unlock(new_dir_ni); 323 dput(new_dentry); 324 if (err) 325 goto out; 326 } 327 328 /* allocate PATH_MAX bytes */ 329 old_de = __getname(); 330 if (!old_de) { 331 err = -ENOMEM; 332 goto out; 333 } 334 335 err = fill_name_de(sbi, old_de, &old_dentry->d_name, NULL); 336 if (err < 0) 337 goto out1; 338 339 old_name = (struct ATTR_FILE_NAME *)(old_de + 1); 340 341 if (is_same) { 342 new_de = old_de; 343 } else { 344 new_de = Add2Ptr(old_de, 1024); 345 err = fill_name_de(sbi, new_de, &new_dentry->d_name, NULL); 346 if (err < 0) 347 goto out1; 348 } 349 350 ni_lock_dir(old_dir_ni); 351 ni_lock(old_ni); 352 353 mi_get_ref(&old_dir_ni->mi, &old_name->home); 354 355 /*get pointer to file_name in mft*/ 356 fname = ni_fname_name(old_ni, (struct cpu_str *)&old_name->name_len, 357 &old_name->home, &le); 358 if (!fname) { 359 err = -EINVAL; 360 goto out2; 361 } 362 363 /* Copy fname info from record into new fname */ 364 new_name = (struct ATTR_FILE_NAME *)(new_de + 1); 365 memcpy(&new_name->dup, &fname->dup, sizeof(fname->dup)); 366 367 name_type = paired_name(fname->type); 368 369 /* remove first name from directory */ 370 err = indx_delete_entry(&old_dir_ni->dir, old_dir_ni, old_de + 1, 371 le16_to_cpu(old_de->key_size), sbi); 372 if (err) 373 goto out3; 374 375 /* remove first name from mft */ 376 err = ni_remove_attr_le(old_ni, attr_from_name(fname), le); 377 if (err) 378 goto out4; 379 380 le16_add_cpu(&old_ni->mi.mrec->hard_links, -1); 381 old_ni->mi.dirty = true; 382 383 if (name_type != FILE_NAME_POSIX) { 384 /* get paired name */ 385 fname = ni_fname_type(old_ni, name_type, &le); 386 if (fname) { 387 /* remove second name from directory */ 388 err = indx_delete_entry(&old_dir_ni->dir, old_dir_ni, 389 fname, fname_full_size(fname), 390 sbi); 391 if (err) 392 goto out5; 393 394 /* remove second name from mft */ 395 err = ni_remove_attr_le(old_ni, attr_from_name(fname), 396 le); 397 if (err) 398 goto out6; 399 400 le16_add_cpu(&old_ni->mi.mrec->hard_links, -1); 401 old_ni->mi.dirty = true; 402 } 403 } 404 405 /* Add new name */ 406 mi_get_ref(&old_ni->mi, &new_de->ref); 407 mi_get_ref(&ntfs_i(new_dir)->mi, &new_name->home); 408 409 new_de_key_size = le16_to_cpu(new_de->key_size); 410 411 /* insert new name in mft */ 412 err = ni_insert_resident(old_ni, new_de_key_size, ATTR_NAME, NULL, 0, 413 &attr, NULL); 414 if (err) 415 goto out7; 416 417 attr->res.flags = RESIDENT_FLAG_INDEXED; 418 419 memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), new_name, new_de_key_size); 420 421 le16_add_cpu(&old_ni->mi.mrec->hard_links, 1); 422 old_ni->mi.dirty = true; 423 424 /* insert new name in directory */ 425 err = indx_insert_entry(&new_dir_ni->dir, new_dir_ni, new_de, sbi, 426 NULL); 427 if (err) 428 goto out8; 429 430 if (IS_DIRSYNC(new_dir)) 431 err = ntfs_sync_inode(old_inode); 432 else 433 mark_inode_dirty(old_inode); 434 435 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); 436 if (IS_DIRSYNC(old_dir)) 437 (void)ntfs_sync_inode(old_dir); 438 else 439 mark_inode_dirty(old_dir); 440 441 if (old_dir != new_dir) { 442 new_dir->i_mtime = new_dir->i_ctime = old_dir->i_ctime; 443 mark_inode_dirty(new_dir); 444 } 445 446 if (old_inode) { ^^^^^^^^^ If old_inode can be NULL we are toasted. 447 old_inode->i_ctime = old_dir->i_ctime; 448 mark_inode_dirty(old_inode); regards, dan carpenter