From: Zongxun Wang <wangzongxun@huawei.com>
Date: Thu, 3 Apr 2014 21:46:45 +0000 (-0700)
Subject: ocfs2: fix null pointer dereference when access dlm_state before launching dlm thread
X-Git-Tag: v3.15-rc1~106^2~213
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=181a9a043b5424f2e6451297bbc27b196fe88475;p=pandora-kernel.git

ocfs2: fix null pointer dereference when access dlm_state before launching dlm thread

When mounting an ocfs2 volume, it will firstly generate a file
/sys/kernel/debug/o2dlm/<uuid>/dlm_state, and then launch the dlm thread.
So the following situation will cause a null pointer dereference.
dlm_debug_init -> access file dlm_state which will call dlm_state_print ->
dlm_launch_thread

Move dlm_debug_init after dlm_launch_thread and dlm_launch_recovery_thread
can fix this issue.

Signed-off-by: Zongxun Wang <wangzongxun@huawei.com>
Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

Reading git-diff-tree failed