From: Eryu Guan <guaneryu@gmail.com>
Date: Thu, 14 May 2015 23:00:45 +0000 (-0400)
Subject: ext4: check for zero length extent explicitly
X-Git-Tag: v3.2.70~71
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=93fa5e650858847f56d90bfdabb18d87bc859663;p=pandora-kernel.git

ext4: check for zero length extent explicitly

commit 2f974865ffdfe7b9f46a9940836c8b167342563d upstream.

The following commit introduced a bug when checking for zero length extent

5946d08 ext4: check for overlapping extents in ext4_valid_extent_entries()

Zero length extent could pass the check if lblock is zero.

Adding the explicit check for zero length back.

Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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