[PATCH 3/4] dm cache metadata: Avoid return pmd->bm wild pointer when process with error

[Ye Bin <yebin10@xxxxxxxxxx>]

Maybe caller will use PTR_ERR as a pointer, it will lead to some strange things.

Signed-off-by: Ye Bin <yebin10@xxxxxxxxxx>
---
 drivers/md/dm-cache-metadata.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/md/dm-cache-metadata.c b/drivers/md/dm-cache-metadata.c
index 151aa95775be..af6d4f898e4c 100644
--- a/drivers/md/dm-cache-metadata.c
+++ b/drivers/md/dm-cache-metadata.c
@@ -537,12 +537,16 @@ static int __create_persistent_data_objects(struct dm_cache_metadata *cmd,
 					  CACHE_MAX_CONCURRENT_LOCKS);
 	if (IS_ERR(cmd->bm)) {
 		DMERR("could not create block manager");
-		return PTR_ERR(cmd->bm);
+		r = PTR_ERR(cmd->bm);
+		cmd->bm = NULL;
+		return r;
 	}
 
 	r = __open_or_format_metadata(cmd, may_format_device);
-	if (r)
+	if (r) {
 		dm_block_manager_destroy(cmd->bm);
+		cmd->bm = NULL;
+	}
 
 	return r;
 }
-- 
2.25.4


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