From: Ye Bin <yebin10@huawei.com>
Date: Tue, 1 Sep 2020 06:25:43 +0000 (+0800)
Subject: dm thin metadata: Avoid returning cmd->bm wild pointer on error
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=eb71cd253b2adfbcb1f09636d18ee6394d6f774d;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

dm thin metadata: Avoid returning cmd->bm wild pointer on error

commit 219403d7e56f9b716ad80ab87db85d29547ee73e 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 <yebin10@huawei.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c
index b85a66f42814..29f8a632b42b 100644
--- a/drivers/md/dm-thin-metadata.c
+++ b/drivers/md/dm-thin-metadata.c
@@ -698,12 +698,16 @@ static int __create_persistent_data_objects(struct dm_pool_metadata *pmd, bool f
 					  THIN_MAX_CONCURRENT_LOCKS);
 	if (IS_ERR(pmd->bm)) {
 		DMERR("could not create block manager");
-		return PTR_ERR(pmd->bm);
+		r = PTR_ERR(pmd->bm);
+		pmd->bm = NULL;
+		return r;
 	}
 
 	r = __open_or_format_metadata(pmd, format_device);
-	if (r)
+	if (r) {
 		dm_block_manager_destroy(pmd->bm);
+		pmd->bm = NULL;
+	}
 
 	return r;
 }