From: Phillip Lougher <phillip@lougher.demon.co.uk>
Date: Tue, 24 May 2011 03:05:22 +0000 (+0100)
Subject: Squashfs: add sanity checks to id reading at mount time
X-Git-Tag: v3.0-rc1~54^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=37986f63c81bf23c856f65fc5e4830550e7f3d5b;p=pandora-kernel.git

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>
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