Squashfs: add sanity checks to id reading at mount time
commit37986f63c81bf23c856f65fc5e4830550e7f3d5b
authorPhillip Lougher <phillip@lougher.demon.co.uk>
Tue, 24 May 2011 03:05:22 +0000 (24 04:05 +0100)
committerPhillip Lougher <phillip@lougher.demon.co.uk>
Wed, 25 May 2011 17:21:32 +0000 (25 18:21 +0100)
treeaafcc2078b469fb8fdb6e43255e136fcc7059dc9
parent6f04864515365e135adc9f1cee4ac1251bb0ed35
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>
fs/squashfs/id.c
fs/squashfs/squashfs.h
fs/squashfs/super.c
fs/squashfs/xattr.h