From: Theodore Ts'o <tytso@mit.edu>
Date: Tue, 17 Feb 2009 15:58:41 +0000 (-0500)
Subject: ext4: only use i_size_high for regular files
X-Git-Tag: v2.6.27.19~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d5f85db686df375bd39168bd0032c4be6863f35c;p=pandora-kernel.git

ext4: only use i_size_high for regular files

(cherry picked from commit 06a279d636734da32bb62dd2f7b0ade666f65d7c)

Directories are not allowed to be bigger than 2GB, so don't use
i_size_high for anything other than regular files.  E2fsck should
complain about these inodes, but the simplest thing to do for the
kernel is to only use i_size_high for regular files.

This prevents an intentially corrupted filesystem from causing the
kernel to burn a huge amount of CPU and issuing error messages such
as:

EXT4-fs warning (device loop0): ext4_block_to_path: block 135090028 > max

Thanks to David Maciejak from Fortinet's FortiGuard Global Security
Research Team for reporting this issue.

http://bugzilla.kernel.org/show_bug.cgi?id=12375

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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