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md: Fix failed allocation of md_register_thread 

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.

Cc: stable@vger.kernel.org # v3.16+
Acked-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Aditya Pakki 2019-03-04 16:48:54 -06:00 committed by Song Liu
parent b761dcf121
commit e406f12dde
2 changed files with 4 additions and 0 deletions
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2
drivers/md/raid10.c
View File

@ -3939,6 +3939,8 @@ static int raid10_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;

2
drivers/md/raid5.c
View File

@ -7403,6 +7403,8 @@ static int raid5_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;
}
/* Ok, everything is just fine now */