From: Jeff Mahoney <jeffm@suse.com>
Date: Thu, 14 Oct 2010 13:53:37 +0000 (-0400)
Subject: hfsplus: fix oops on mount with corrupted btree extent records
X-Git-Tag: v2.6.37-rc1~222^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ee52716245877b821f5ddbb3ace85b73084fb450;p=pandora-kernel.git

hfsplus: fix oops on mount with corrupted btree extent records

A particular fsfuzzer run caused an hfs file system to crash on mount. This
is due to a corrupted MDB extent record causing a miscalculation of
HFSPLUS_I(inode)->first_blocks for the extent tree. If the extent records
are zereod out, then it won't trigger the first_blocks special case and
instead falls through to the extent code, which we're in the middle
of initializing.

This patch catches the 0 size extent records, reports the corruption,
and fails the mount.

[hch: ported of commit 47f365eb575735c6b2edf5d08e0d16d26a9c23bd from hfs]

Reported-by: Ramon de Carvalho Valle <rcvalle@linux.vnet.ibm.com>
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Christoph Hellwig <hch@tuxera.com>
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