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Diffstat (limited to 'fs/squashfs/xattr_id.c')
-rw-r--r--fs/squashfs/xattr_id.c47
1 files changed, 21 insertions, 26 deletions
diff --git a/fs/squashfs/xattr_id.c b/fs/squashfs/xattr_id.c
index 05385dbe1465..c89607d690c4 100644
--- a/fs/squashfs/xattr_id.c
+++ b/fs/squashfs/xattr_id.c
@@ -2,7 +2,7 @@
* Squashfs - a compressed read only filesystem for Linux
*
* Copyright (c) 2010
- * Phillip Lougher <phillip@lougher.demon.co.uk>
+ * Phillip Lougher <phillip@squashfs.org.uk>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -67,34 +67,29 @@ __le64 *squashfs_read_xattr_id_table(struct super_block *sb, u64 start,
u64 *xattr_table_start, int *xattr_ids)
{
unsigned int len;
- __le64 *xid_table;
- struct squashfs_xattr_id_table id_table;
- int err;
+ struct squashfs_xattr_id_table *id_table;
+
+ id_table = squashfs_read_table(sb, start, sizeof(*id_table));
+ if (IS_ERR(id_table))
+ return (__le64 *) id_table;
+
+ *xattr_table_start = le64_to_cpu(id_table->xattr_table_start);
+ *xattr_ids = le32_to_cpu(id_table->xattr_ids);
+ kfree(id_table);
+
+ /* Sanity check values */
+
+ /* there is always at least one xattr id */
+ if (*xattr_ids == 0)
+ return ERR_PTR(-EINVAL);
+
+ /* xattr_table should be less than start */
+ if (*xattr_table_start >= start)
+ return ERR_PTR(-EINVAL);
- err = squashfs_read_table(sb, &id_table, start, sizeof(id_table));
- if (err < 0) {
- ERROR("unable to read xattr id table\n");
- return ERR_PTR(err);
- }
- *xattr_table_start = le64_to_cpu(id_table.xattr_table_start);
- *xattr_ids = le32_to_cpu(id_table.xattr_ids);
len = SQUASHFS_XATTR_BLOCK_BYTES(*xattr_ids);
TRACE("In read_xattr_index_table, length %d\n", len);
- /* Allocate xattr id lookup table indexes */
- xid_table = kmalloc(len, GFP_KERNEL);
- if (xid_table == NULL) {
- ERROR("Failed to allocate xattr id index table\n");
- return ERR_PTR(-ENOMEM);
- }
-
- err = squashfs_read_table(sb, xid_table, start + sizeof(id_table), len);
- if (err < 0) {
- ERROR("unable to read xattr id index table\n");
- kfree(xid_table);
- return ERR_PTR(err);
- }
-
- return xid_table;
+ return squashfs_read_table(sb, start + sizeof(*id_table), len);
}