[PATCH v3 1/3] btrfs: block-group: Fix a memory leak due to missing btrfs_put_block_group()

[Qu Wenruo]

In btrfs_read_block_groups(), if we have an invalid block group which
has mixed type (DATA|METADATA) while the fs doesn't have MIX_BGS
feature, we error out without freeing the block group cache.

This patch will add the missing btrfs_put_block_group() to prevent
memory leak.

Fixes: 49303381f19a ("Btrfs: bail out if block group has different mixed flag")
Signed-off-by: Qu Wenruo <w...@suse.com>
---
 fs/btrfs/block-group.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c
index bf7e3f23bba7..c906a2b6c2cf 100644
--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -1762,6 +1762,7 @@ int btrfs_read_block_groups(struct btrfs_fs_info *info)
 "bg %llu is a mixed block group but filesystem hasn't enabled mixed block 
groups",
                                  cache->key.objectid);
                        ret = -EINVAL;
+                       btrfs_put_block_group(cache);
                        goto error;
                }
 
-- 
2.23.0