fs/squashfs/id.c

1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Squashfs - a compressed read only filesystem for Linux
15  * converted to 32-bit uids/gids using an id look up table.  This table is
30  * Map uid/gid index into real 32-bit uid/gid using the id look up table
35 	struct squashfs_sb_info *msblk = sb->s_fs_info;  in squashfs_get_id()
42 	if (index >= msblk->ids)  in squashfs_get_id()
43 		return -EINVAL;  in squashfs_get_id()
45 	start_block = le64_to_cpu(msblk->id_table[block]);  in squashfs_get_id()
75 		return ERR_PTR(-EINVAL);  in squashfs_read_id_index_table()
81 	if (length != (next_table - id_table_start))  in squashfs_read_id_index_table()
82 		return ERR_PTR(-EINVAL);  in squashfs_read_id_index_table()
89 	 * table[0], table[1], ... table[indexes - 1] store the locations  in squashfs_read_id_index_table()
92 	 * should be SQUASHFS_METADATA_SIZE or less.  table[indexes - 1]  in squashfs_read_id_index_table()
96 	for (n = 0; n < (indexes - 1); n++) {  in squashfs_read_id_index_table()
100 		if (start >= end || (end - start) >  in squashfs_read_id_index_table()
103 			return ERR_PTR(-EINVAL);  in squashfs_read_id_index_table()
107 	start = le64_to_cpu(table[indexes - 1]);  in squashfs_read_id_index_table()
108 	if (start >= id_table_start || (id_table_start - start) >  in squashfs_read_id_index_table()
111 		return ERR_PTR(-EINVAL);  in squashfs_read_id_index_table()