From 93fa5e650858847f56d90bfdabb18d87bc859663 Mon Sep 17 00:00:00 2001
From: Eryu Guan <guaneryu@gmail.com>
Date: Thu, 14 May 2015 19:00:45 -0400
Subject: [PATCH] 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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