From: Miao Xie <miaox@cn.fujitsu.com>
Date: Thu, 25 Mar 2010 12:37:12 +0000 (+0000)
Subject: Btrfs: add NULL check for do_walk_down()
X-Git-Tag: v2.6.34-rc4~69^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=90d2c51dbb4db05c040bc7db264bb7ab35e35455;p=pandora-kernel.git

Btrfs: add NULL check for do_walk_down()

btrfs_find_create_tree_block() may return NULL, so we must check the returned
value, or we will access a NULL pointer.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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