tree 4bb7011f0f5be9047d601c889a8bf02da096cefd
parent 003a3194d36dc22c29cacda4d0c6fede2753c9d0
author Phillip Lougher <phillip@lougher.demon.co.uk> 1300226995 +0000
committer Phillip Lougher <phillip@lougher.demon.co.uk> 1300237458 +0000

Squashfs: handle corruption of directory structure

Handle the rare case where a directory metadata block is uncompressed and
corrupted, leading to a kernel oops in directory scanning (memcpy).
Normally corruption is detected at the decompression stage and dealt with
then, however, this will not happen if:

- metadata isn't compressed (users can optionally request no metadata
  compression), or
- the compressed metadata block was larger than the original, in which
  case the uncompressed version was used, or
- the data was corrupt after decompression

This patch fixes this by adding some sanity checks against known maximum
values.

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>