fs/exfat/namei.c:1297:6: warning: Variable 'ret' is reassigned a value before the old one has been used.

From: kernel test robot
Date: Thu Aug 06 2020 - 06:33:21 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 47ec5303d73ea344e84f46660fff693c57641386
commit: b9d1e2e6265f5dc25e9f5dbfbde3e53d8a4958ac exfat: add Kconfig and Makefile
date: 5 months ago
compiler: ia64-linux-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

cppcheck warnings: (new ones prefixed by >>)

>> fs/exfat/namei.c:1297:6: warning: Variable 'ret' is reassigned a value before the old one has been used. [redundantAssignment]
ret = exfat_resolve_path(new_parent_inode, new_path, &newdir,
^
fs/exfat/namei.c:1260:7: note: Variable 'ret' is reassigned a value before the old one has been used.
ret = -EIO;
^
fs/exfat/namei.c:1297:6: note: Variable 'ret' is reassigned a value before the old one has been used.
ret = exfat_resolve_path(new_parent_inode, new_path, &newdir,
^

vim +/ret +1297 fs/exfat/namei.c

5f2aa075070cf5 Namjae Jeon 2020-03-02 1214
5f2aa075070cf5 Namjae Jeon 2020-03-02 1215 /* rename or move a old file into a new file */
5f2aa075070cf5 Namjae Jeon 2020-03-02 1216 static int __exfat_rename(struct inode *old_parent_inode,
5f2aa075070cf5 Namjae Jeon 2020-03-02 1217 struct exfat_inode_info *ei, struct inode *new_parent_inode,
5f2aa075070cf5 Namjae Jeon 2020-03-02 1218 struct dentry *new_dentry)
5f2aa075070cf5 Namjae Jeon 2020-03-02 1219 {
5f2aa075070cf5 Namjae Jeon 2020-03-02 1220 int ret;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1221 int dentry;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1222 struct exfat_chain olddir, newdir;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1223 struct exfat_chain *p_dir = NULL;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1224 struct exfat_uni_name uni_name;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1225 struct exfat_dentry *ep;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1226 struct super_block *sb = old_parent_inode->i_sb;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1227 struct exfat_sb_info *sbi = EXFAT_SB(sb);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1228 const unsigned char *new_path = new_dentry->d_name.name;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1229 struct inode *new_inode = new_dentry->d_inode;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1230 int num_entries;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1231 struct exfat_inode_info *new_ei = NULL;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1232 unsigned int new_entry_type = TYPE_UNUSED;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1233 int new_entry = 0;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1234 struct buffer_head *old_bh, *new_bh = NULL;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1235
5f2aa075070cf5 Namjae Jeon 2020-03-02 1236 /* check the validity of pointer parameters */
5f2aa075070cf5 Namjae Jeon 2020-03-02 1237 if (new_path == NULL || strlen(new_path) == 0)
5f2aa075070cf5 Namjae Jeon 2020-03-02 1238 return -EINVAL;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1239
5f2aa075070cf5 Namjae Jeon 2020-03-02 1240 if (ei->dir.dir == DIR_DELETED) {
5f2aa075070cf5 Namjae Jeon 2020-03-02 1241 exfat_msg(sb, KERN_ERR,
5f2aa075070cf5 Namjae Jeon 2020-03-02 1242 "abnormal access to deleted source dentry");
5f2aa075070cf5 Namjae Jeon 2020-03-02 1243 return -ENOENT;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1244 }
5f2aa075070cf5 Namjae Jeon 2020-03-02 1245
5f2aa075070cf5 Namjae Jeon 2020-03-02 1246 exfat_update_parent_info(ei, old_parent_inode);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1247
5f2aa075070cf5 Namjae Jeon 2020-03-02 1248 exfat_chain_dup(&olddir, &ei->dir);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1249 dentry = ei->entry;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1250
5f2aa075070cf5 Namjae Jeon 2020-03-02 1251 ep = exfat_get_dentry(sb, &olddir, dentry, &old_bh, NULL);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1252 if (!ep) {
5f2aa075070cf5 Namjae Jeon 2020-03-02 1253 ret = -EIO;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1254 goto out;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1255 }
5f2aa075070cf5 Namjae Jeon 2020-03-02 1256 brelse(old_bh);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1257
5f2aa075070cf5 Namjae Jeon 2020-03-02 1258 /* check whether new dir is existing directory and empty */
5f2aa075070cf5 Namjae Jeon 2020-03-02 1259 if (new_inode) {
5f2aa075070cf5 Namjae Jeon 2020-03-02 1260 ret = -EIO;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1261 new_ei = EXFAT_I(new_inode);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1262
5f2aa075070cf5 Namjae Jeon 2020-03-02 1263 if (new_ei->dir.dir == DIR_DELETED) {
5f2aa075070cf5 Namjae Jeon 2020-03-02 1264 exfat_msg(sb, KERN_ERR,
5f2aa075070cf5 Namjae Jeon 2020-03-02 1265 "abnormal access to deleted target dentry");
5f2aa075070cf5 Namjae Jeon 2020-03-02 1266 goto out;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1267 }
5f2aa075070cf5 Namjae Jeon 2020-03-02 1268
5f2aa075070cf5 Namjae Jeon 2020-03-02 1269 exfat_update_parent_info(new_ei, new_parent_inode);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1270
5f2aa075070cf5 Namjae Jeon 2020-03-02 1271 p_dir = &(new_ei->dir);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1272 new_entry = new_ei->entry;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1273 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1274 if (!ep)
5f2aa075070cf5 Namjae Jeon 2020-03-02 1275 goto out;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1276
5f2aa075070cf5 Namjae Jeon 2020-03-02 1277 new_entry_type = exfat_get_entry_type(ep);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1278 brelse(new_bh);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1279
5f2aa075070cf5 Namjae Jeon 2020-03-02 1280 /* if new_inode exists, update ei */
5f2aa075070cf5 Namjae Jeon 2020-03-02 1281 if (new_entry_type == TYPE_DIR) {
5f2aa075070cf5 Namjae Jeon 2020-03-02 1282 struct exfat_chain new_clu;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1283
5f2aa075070cf5 Namjae Jeon 2020-03-02 1284 new_clu.dir = new_ei->start_clu;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1285 new_clu.size =
5f2aa075070cf5 Namjae Jeon 2020-03-02 1286 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
5f2aa075070cf5 Namjae Jeon 2020-03-02 1287 sbi);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1288 new_clu.flags = new_ei->flags;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1289
5f2aa075070cf5 Namjae Jeon 2020-03-02 1290 ret = exfat_check_dir_empty(sb, &new_clu);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1291 if (ret)
5f2aa075070cf5 Namjae Jeon 2020-03-02 1292 goto out;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1293 }
5f2aa075070cf5 Namjae Jeon 2020-03-02 1294 }
5f2aa075070cf5 Namjae Jeon 2020-03-02 1295
5f2aa075070cf5 Namjae Jeon 2020-03-02 1296 /* check the validity of directory name in the given new pathname */
5f2aa075070cf5 Namjae Jeon 2020-03-02 @1297 ret = exfat_resolve_path(new_parent_inode, new_path, &newdir,
5f2aa075070cf5 Namjae Jeon 2020-03-02 1298 &uni_name);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1299 if (ret)
5f2aa075070cf5 Namjae Jeon 2020-03-02 1300 goto out;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1301
5f2aa075070cf5 Namjae Jeon 2020-03-02 1302 exfat_set_vol_flags(sb, VOL_DIRTY);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1303
5f2aa075070cf5 Namjae Jeon 2020-03-02 1304 if (olddir.dir == newdir.dir)
5f2aa075070cf5 Namjae Jeon 2020-03-02 1305 ret = exfat_rename_file(new_parent_inode, &olddir, dentry,
5f2aa075070cf5 Namjae Jeon 2020-03-02 1306 &uni_name, ei);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1307 else
5f2aa075070cf5 Namjae Jeon 2020-03-02 1308 ret = exfat_move_file(new_parent_inode, &olddir, dentry,
5f2aa075070cf5 Namjae Jeon 2020-03-02 1309 &newdir, &uni_name, ei);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1310
5f2aa075070cf5 Namjae Jeon 2020-03-02 1311 if (!ret && new_inode) {
5f2aa075070cf5 Namjae Jeon 2020-03-02 1312 /* delete entries of new_dir */
5f2aa075070cf5 Namjae Jeon 2020-03-02 1313 ep = exfat_get_dentry(sb, p_dir, new_entry, &new_bh, NULL);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1314 if (!ep) {
5f2aa075070cf5 Namjae Jeon 2020-03-02 1315 ret = -EIO;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1316 goto del_out;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1317 }
5f2aa075070cf5 Namjae Jeon 2020-03-02 1318
5f2aa075070cf5 Namjae Jeon 2020-03-02 1319 num_entries = exfat_count_ext_entries(sb, p_dir, new_entry, ep);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1320 if (num_entries < 0) {
5f2aa075070cf5 Namjae Jeon 2020-03-02 1321 ret = -EIO;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1322 goto del_out;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1323 }
5f2aa075070cf5 Namjae Jeon 2020-03-02 1324 brelse(new_bh);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1325
5f2aa075070cf5 Namjae Jeon 2020-03-02 1326 if (exfat_remove_entries(new_inode, p_dir, new_entry, 0,
5f2aa075070cf5 Namjae Jeon 2020-03-02 1327 num_entries + 1)) {
5f2aa075070cf5 Namjae Jeon 2020-03-02 1328 ret = -EIO;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1329 goto del_out;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1330 }
5f2aa075070cf5 Namjae Jeon 2020-03-02 1331
5f2aa075070cf5 Namjae Jeon 2020-03-02 1332 /* Free the clusters if new_inode is a dir(as if exfat_rmdir) */
5f2aa075070cf5 Namjae Jeon 2020-03-02 1333 if (new_entry_type == TYPE_DIR) {
5f2aa075070cf5 Namjae Jeon 2020-03-02 1334 /* new_ei, new_clu_to_free */
5f2aa075070cf5 Namjae Jeon 2020-03-02 1335 struct exfat_chain new_clu_to_free;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1336
5f2aa075070cf5 Namjae Jeon 2020-03-02 1337 exfat_chain_set(&new_clu_to_free, new_ei->start_clu,
5f2aa075070cf5 Namjae Jeon 2020-03-02 1338 EXFAT_B_TO_CLU_ROUND_UP(i_size_read(new_inode),
5f2aa075070cf5 Namjae Jeon 2020-03-02 1339 sbi), new_ei->flags);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1340
5f2aa075070cf5 Namjae Jeon 2020-03-02 1341 if (exfat_free_cluster(new_inode, &new_clu_to_free)) {
5f2aa075070cf5 Namjae Jeon 2020-03-02 1342 /* just set I/O error only */
5f2aa075070cf5 Namjae Jeon 2020-03-02 1343 ret = -EIO;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1344 }
5f2aa075070cf5 Namjae Jeon 2020-03-02 1345
5f2aa075070cf5 Namjae Jeon 2020-03-02 1346 i_size_write(new_inode, 0);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1347 new_ei->start_clu = EXFAT_EOF_CLUSTER;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1348 new_ei->flags = ALLOC_NO_FAT_CHAIN;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1349 }
5f2aa075070cf5 Namjae Jeon 2020-03-02 1350 del_out:
5f2aa075070cf5 Namjae Jeon 2020-03-02 1351 /* Update new_inode ei
5f2aa075070cf5 Namjae Jeon 2020-03-02 1352 * Prevent syncing removed new_inode
5f2aa075070cf5 Namjae Jeon 2020-03-02 1353 * (new_ei is already initialized above code ("if (new_inode)")
5f2aa075070cf5 Namjae Jeon 2020-03-02 1354 */
5f2aa075070cf5 Namjae Jeon 2020-03-02 1355 new_ei->dir.dir = DIR_DELETED;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1356 }
5f2aa075070cf5 Namjae Jeon 2020-03-02 1357 exfat_set_vol_flags(sb, VOL_CLEAN);
5f2aa075070cf5 Namjae Jeon 2020-03-02 1358 out:
5f2aa075070cf5 Namjae Jeon 2020-03-02 1359 return ret;
5f2aa075070cf5 Namjae Jeon 2020-03-02 1360 }
5f2aa075070cf5 Namjae Jeon 2020-03-02 1361

:::::: The code at line 1297 was first introduced by commit
:::::: 5f2aa075070cf5b2e6aae011d5a3390408d7d913 exfat: add inode operations

:::::: TO: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
:::::: CC: Al Viro <viro@xxxxxxxxxxxxxxxxxx>

---
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