dm era: check for a non-NULL metadata object before closing it
era_ctr() may call era_destroy() before era->md is initialized so
era_destory() must only close the metadata object if it is not NULL.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Naohiro Aota <naota@elisp.net>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # 3.15+
diff --git a/drivers/md/dm-era-target.c b/drivers/md/dm-era-target.c
index 414dad4..ad913cd 100644
--- a/drivers/md/dm-era-target.c
+++ b/drivers/md/dm-era-target.c
@@ -1391,7 +1391,8 @@
static void era_destroy(struct era *era)
{
- metadata_close(era->md);
+ if (era->md)
+ metadata_close(era->md);
if (era->wq)
destroy_workqueue(era->wq);