[PATCH 4.19 77/88] dm cache metadata: Avoid returning cmd->bm wild pointer on error

[Greg Kroah-Hartman]

From: Ye Bin <yebi...@huawei.com>

commit d16ff19e69ab57e08bf908faaacbceaf660249de upstream.

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

Signed-off-by: Ye Bin <yebi...@huawei.com>
Cc: sta...@vger.kernel.org
Signed-off-by: Mike Snitzer <snit...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/md/dm-cache-metadata.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/md/dm-cache-metadata.c
+++ b/drivers/md/dm-cache-metadata.c
@@ -537,12 +537,16 @@ static int __create_persistent_data_obje
                                          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;
 }