tree aafcc2078b469fb8fdb6e43255e136fcc7059dc9
parent 6f04864515365e135adc9f1cee4ac1251bb0ed35
author Phillip Lougher <phillip@lougher.demon.co.uk> 1306206322 +0100
committer Phillip Lougher <phillip@lougher.demon.co.uk> 1306344092 +0100

Squashfs: add sanity checks to id reading at mount time

Fsfuzzer generates corrupted filesystems which throw a warn_on in
kmalloc.  One of these is due to a corrupted superblock no_ids field.
Fix this by checking that the number of bytes to be read (and allocated)
does not extend into the next filesystem structure.

Also add a couple of other sanity checks of the mount-time id table
structures.

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