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| author | Phillip Lougher <phillip@squashfs.org.uk> | 2013-09-03 04:21:52 +0100 |
|---|---|---|
| committer | Phillip Lougher <phillip@squashfs.org.uk> | 2013-09-06 04:57:53 +0100 |
| commit | 52e9ce1c0f2060661e147ffaf701a17f2fc0a153 (patch) | |
| tree | f2aab5b8acc99d967bc507da019e95f6ded80292 /fs/squashfs | |
| parent | 9dbc41d5d371cb10099c8182552f3915920e69b6 (diff) | |
| download | linux-52e9ce1c0f2060661e147ffaf701a17f2fc0a153.tar.gz linux-52e9ce1c0f2060661e147ffaf701a17f2fc0a153.tar.bz2 linux-52e9ce1c0f2060661e147ffaf701a17f2fc0a153.zip | |
Squashfs: fix corruption checks in squashfs_lookup()
The dir_count and size fields when read from disk are sanity
checked for correctness. However, the sanity checks only check the
values are not greater than expected. As dir_count and size were
incorrectly defined as signed ints, this can lead to corrupted values
appearing as negative which are not trapped.
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
Diffstat (limited to 'fs/squashfs')
| -rw-r--r-- | fs/squashfs/namei.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/squashfs/namei.c b/fs/squashfs/namei.c index 342a5aa5a0e4..67cad77fefb4 100644 --- a/fs/squashfs/namei.c +++ b/fs/squashfs/namei.c @@ -147,7 +147,8 @@ static struct dentry *squashfs_lookup(struct inode *dir, struct dentry *dentry, struct squashfs_dir_entry *dire; u64 block = squashfs_i(dir)->start + msblk->directory_table; int offset = squashfs_i(dir)->offset; - int err, length, dir_count, size; + int err, length; + unsigned int dir_count, size; TRACE("Entered squashfs_lookup [%llx:%x]\n", block, offset); |