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Squashfs: add sanity checks to xattr reading at mount time 

These checks add sanity checking of the mount-time xattr structures.

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
This commit is contained in:
Phillip Lougher 2011-05-24 03:20:27 +01:00
parent 76e002f755
commit 6f04864515
1 changed files with 11 additions and 0 deletions
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11
fs/squashfs/xattr_id.c
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@ -76,6 +76,17 @@ __le64 *squashfs_read_xattr_id_table(struct super_block *sb, u64 start,
*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);
len = SQUASHFS_XATTR_BLOCK_BYTES(*xattr_ids);
TRACE("In read_xattr_index_table, length %d\n", len);