md-cluster: init suspend_list and suspend_lock early in join
If the node just join the cluster, and receive the msg from other nodes
before init suspend_list, it will cause kernel crash due to NULL pointer
dereference, so move the initializations early to fix the bug.
md-cluster: Joined cluster 3578507b-e0cb-6d4f-6322-696cd7b1b10c slot 3
BUG: unable to handle kernel NULL pointer dereference at (null)
... ... ...
Call Trace:
[<ffffffffa0444924>] process_recvd_msg+0x2e4/0x330 [md_cluster]
[<ffffffffa0444a06>] recv_daemon+0x96/0x170 [md_cluster]
[<ffffffffa045189d>] md_thread+0x11d/0x170 [md_mod]
[<ffffffff810768c4>] kthread+0xb4/0xc0
[<ffffffff8151927c>] ret_from_fork+0x7c/0xb0
... ... ...
RIP [<ffffffffa0443581>] __remove_suspend_info+0x11/0xa0 [md_cluster]
Reviewed-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: NeilBrown <neilb@suse.com>
diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index b80a689..6f1ea3c 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -671,6 +671,8 @@
if (!cinfo)
return -ENOMEM;
+ INIT_LIST_HEAD(&cinfo->suspend_list);
+ spin_lock_init(&cinfo->suspend_lock);
init_completion(&cinfo->completion);
mutex_init(&cinfo->sb_mutex);
@@ -736,9 +738,6 @@
goto err;
}
- INIT_LIST_HEAD(&cinfo->suspend_list);
- spin_lock_init(&cinfo->suspend_lock);
-
ret = gather_all_resync_info(mddev, nodes);
if (ret)
goto err;