[Ocfs2-devel] [PATCH] ocfs2: fix null pointer dereference when access dlm_state before launching dlm thread
Joseph Qi
joseph.qi at huawei.com
Tue Feb 11 04:15:02 PST 2014
From: Zongxun Wang <wangzongxun at huawei.com>
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 at huawei.com>
Signed-off-by: Joseph Qi <joseph.qi at huawei.com>
---
fs/ocfs2/dlm/dlmdomain.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c
index 33660a4..1307a8c 100644
--- a/fs/ocfs2/dlm/dlmdomain.c
+++ b/fs/ocfs2/dlm/dlmdomain.c
@@ -1877,19 +1877,19 @@ static int dlm_join_domain(struct dlm_ctxt *dlm)
goto bail;
}
- status = dlm_debug_init(dlm);
+ status = dlm_launch_thread(dlm);
if (status < 0) {
mlog_errno(status);
goto bail;
}
- status = dlm_launch_thread(dlm);
+ status = dlm_launch_recovery_thread(dlm);
if (status < 0) {
mlog_errno(status);
goto bail;
}
- status = dlm_launch_recovery_thread(dlm);
+ status = dlm_debug_init(dlm);
if (status < 0) {
mlog_errno(status);
goto bail;
--
1.8.4.3
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