[PATCH 3/3] fs/squashfs: do not use CMD_RET_* defines in the filesystem code
Thomas Petazzoni
thomas.petazzoni at bootlin.com
Wed Jul 15 22:11:43 CEST 2020
Using CMD_RET_* defines in fs/squashfs/ breaks the build as they are
not defined. These defines are really meant to be used as return
values of commands, not internally in filesystem code. Instead,
appropriate errno codes should be used.
This patch changes fs/squashfs to use proper errno code. In most
places, it is straightforward. There are a few places where it is not:
- In sqfs_read(), the value of datablk_count was checked *after* it
was used to do a memcpy(). So the memcpy() could have used a
negative size. The check was moved prior to the memcpy(), right
after calling sqfs_get_regfile_info() and sqfs_get_lregfile_info().
- The sqfs_size() function is modified to return "ret" at the end, so
that the error code is properly propagated.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
---
fs/squashfs/sqfs.c | 61 +++++++++++++++++++---------------------------
1 file changed, 25 insertions(+), 36 deletions(-)
diff --git a/fs/squashfs/sqfs.c b/fs/squashfs/sqfs.c
index 8d43564b50..27f0b33a92 100644
--- a/fs/squashfs/sqfs.c
+++ b/fs/squashfs/sqfs.c
@@ -1241,10 +1241,8 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
*/
sqfs_split_path(&file, &dir, filename);
ret = sqfs_opendir(dir, &dirs.fs_dirs);
- if (ret) {
- ret = CMD_RET_FAILURE;
+ if (ret)
goto free_paths;
- }
dirsp = (struct fs_dir_stream *)&dirs;
dirs.dentp = &dent;
@@ -1253,7 +1251,6 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
if (!strncmp(dent.name, file, strlen(dent.name))) {
ret = sqfs_read_entry(&entry, dirs.entry);
if (ret) {
- ret = CMD_RET_FAILURE;
free(dirs.entry);
sqfs_closedir(dirsp);
goto free_paths;
@@ -1269,7 +1266,7 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
printf("File not found.\n");
*actread = 0;
sqfs_closedir(dirsp);
- ret = CMD_RET_FAILURE;
+ ret = -ENOENT;
goto free_paths;
}
@@ -1283,6 +1280,10 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
memcpy(®, ipos, sizeof(reg));
datablk_count = sqfs_get_regfile_info(®, &finfo, &frag_entry,
sblk->block_size);
+ if (datablk_count < 0) {
+ ret = -EINVAL;
+ goto free_entry;
+ }
memcpy(finfo.blk_sizes, ipos + sizeof(reg),
datablk_count * sizeof(u32));
break;
@@ -1291,6 +1292,10 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
datablk_count = sqfs_get_lregfile_info(&lreg, &finfo,
&frag_entry,
sblk->block_size);
+ if (datablk_count < 0) {
+ ret = -EINVAL;
+ goto free_entry;
+ }
memcpy(finfo.blk_sizes, ipos + sizeof(lreg),
datablk_count * sizeof(u32));
break;
@@ -1301,9 +1306,6 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
printf("%s - > %s\n", filename, resolved);
ret = sqfs_read(resolved, buf, offset, len, actread);
free(resolved);
- if (ret)
- ret = CMD_RET_FAILURE;
- ret = CMD_RET_SUCCESS;
goto free_entry;
case SQFS_BLKDEV_TYPE:
case SQFS_CHRDEV_TYPE:
@@ -1315,19 +1317,14 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
case SQFS_LSOCKET_TYPE:
default:
printf("Unsupported entry type\n");
- ret = CMD_RET_FAILURE;
- goto free_entry;
- }
-
- if (datablk_count < 0) {
- ret = CMD_RET_FAILURE;
+ ret = -EINVAL;
goto free_entry;
}
/* If the user specifies a length, check its sanity */
if (len) {
if (len > finfo.size) {
- ret = CMD_RET_FAILURE;
+ ret = -EINVAL;
goto free_entry;
}
@@ -1338,7 +1335,7 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
data_offset = finfo.start;
datablock = malloc(sblk->block_size);
if (!datablock) {
- ret = CMD_RET_FAILURE;
+ ret = -ENOMEM;
goto free_entry;
}
}
@@ -1353,18 +1350,18 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
data_buffer = malloc_cache_aligned(n_blks * cur_dev->blksz);
if (!data_buffer) {
- ret = CMD_RET_FAILURE;
+ ret = -ENOMEM;
goto free_datablk;
}
- if (sqfs_disk_read(start, n_blks, data_buffer) < 0) {
+ ret = sqfs_disk_read(start, n_blks, data_buffer);
+ if (ret < 0) {
/*
* Tip: re-compile the SquashFS image with mksquashfs's
* -b <block_size> option.
*/
printf("Error: too many data blocks or too large"\
"SquashFS block size.\n");
- ret = CMD_RET_FAILURE;
goto free_buffer;
}
@@ -1375,10 +1372,8 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
dest_len = sblk->block_size;
ret = sqfs_decompress(comp_type, datablock, &dest_len,
data, table_size);
- if (ret) {
- ret = CMD_RET_FAILURE;
+ if (ret)
goto free_buffer;
- }
memcpy(buf + offset + *actread, datablock, dest_len);
*actread += dest_len;
@@ -1396,7 +1391,7 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
* There is no need to continue if the file is not fragmented.
*/
if (!finfo.frag) {
- ret = CMD_RET_SUCCESS;
+ ret = 0;
goto free_buffer;
}
@@ -1408,21 +1403,20 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
fragment = malloc_cache_aligned(n_blks * cur_dev->blksz);
if (!fragment) {
- ret = CMD_RET_FAILURE;
+ ret = -ENOMEM;
goto free_buffer;
}
- if (sqfs_disk_read(start, n_blks, fragment) < 0) {
- ret = CMD_RET_FAILURE;
+ ret = sqfs_disk_read(start, n_blks, fragment);
+ if (ret < 0)
goto free_fragment;
- }
/* File compressed and fragmented */
if (finfo.frag && finfo.comp) {
dest_len = sblk->block_size;
fragment_block = malloc(sblk->block_size);
if (!fragment_block) {
- ret = CMD_RET_FAILURE;
+ ret = -ENOMEM;
goto free_fragment;
}
@@ -1431,7 +1425,6 @@ int sqfs_read(const char *filename, void *buf, loff_t offset, loff_t len,
frag_entry.size);
if (ret) {
free(fragment_block);
- ret = CMD_RET_FAILURE;
goto free_fragment;
}
@@ -1480,7 +1473,7 @@ int sqfs_ls(const char *filename)
ret = sqfs_opendir(filename, &dirs.fs_dirs);
if (ret) {
sqfs_closedir(dirsp);
- return CMD_RET_FAILURE;
+ return ret;
}
dirs.dentp = &dent;
@@ -1542,7 +1535,6 @@ int sqfs_size(const char *filename, loff_t *size)
ret = sqfs_opendir(dir, &dirs.fs_dirs);
if (ret) {
sqfs_closedir(dirsp);
- ret = CMD_RET_FAILURE;
goto free_strings;
}
@@ -1558,7 +1550,6 @@ int sqfs_size(const char *filename, loff_t *size)
if (ret) {
sqfs_closedir(dirsp);
- ret = CMD_RET_FAILURE;
goto free_strings;
}
@@ -1583,9 +1574,6 @@ int sqfs_size(const char *filename, loff_t *size)
resolved = sqfs_resolve_symlink(&symlink, ipos, filename);
ret = sqfs_size(resolved, size);
free(resolved);
- if (ret)
- ret = CMD_RET_FAILURE;
- ret = CMD_RET_SUCCESS;
break;
case SQFS_BLKDEV_TYPE:
case SQFS_CHRDEV_TYPE:
@@ -1598,6 +1586,7 @@ int sqfs_size(const char *filename, loff_t *size)
default:
printf("Unable to recover entry's size.\n");
*size = 0;
+ ret = -EINVAL;
break;
}
@@ -1608,7 +1597,7 @@ free_strings:
free(sblk);
sqfs_closedir(dirsp);
- return 0;
+ return ret;
}
void sqfs_close(void)
--
2.26.2
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