From: Akira Fujita <a-fujita@rs.jp.nec.com>
Date: Wed, 16 Sep 2009 18:25:07 +0000 (-0400)
Subject: ext4: Add null extent check to ext_get_path
X-Git-Tag: v2.6.32-rc1~633^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=347fa6f1c7cb5df2b38d3c9167cfe242ce0cd1da;p=pandora-kernel.git

ext4: Add null extent check to ext_get_path

There is the possibility that path structure which is taken
by ext4_ext_find_extent() indicates null extents.
Because during data block exchanging in ext4_move_extents(),
constitution of an extent tree may be changed.
As a solution, the patch adds null extent check
to ext_get_path().

Reported-by: Peng Tao <bergwolf@gmail.com>
Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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