[PATCH 3.16 115/129] md: Fix failed allocation of md_register_thread

[Ben Hutchings]

3.16.70-rc1 review patch.  If anyone has any objections, please let me know.

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From: Aditya Pakki <pakki001@xxxxxxx>

commit e406f12dde1a8375d77ea02d91f313fb1a9c6aec upstream.

mddev->sync_thread can be set to NULL on kzalloc failure downstream.
The patch checks for such a scenario and frees allocated resources.

Committer node:

Added similar fix to raid5.c, as suggested by Guoqing.

Acked-by: Guoqing Jiang <gqjiang@xxxxxxxx>
Signed-off-by: Aditya Pakki <pakki001@xxxxxxx>
Signed-off-by: Song Liu <songliubraving@xxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/md/raid10.c | 2 ++
 drivers/md/raid5.c  | 2 ++
 2 files changed, 4 insertions(+)

--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3820,6 +3820,8 @@ static int run(struct mddev *mddev)
 		set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
 		mddev->sync_thread = md_register_thread(md_do_sync, mddev,
 							"reshape");
+		if (!mddev->sync_thread)
+			goto out_free_conf;
 	}
 
 	return 0;
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6180,6 +6180,8 @@ static int run(struct mddev *mddev)
 		set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
 		mddev->sync_thread = md_register_thread(md_do_sync, mddev,
 							"reshape");
+		if (!mddev->sync_thread)
+			goto abort;
 	}