Commit 6cd5be98 authored Oct 10, 2019 by Qu Wenruo Committed by Greg Kroah-Hartman Oct 29, 2019

btrfs: block-group: Fix a memory leak due to missing btrfs_put_block_group()



commit 4b654acdae850f48b8250b9a578a4eaa518c7a6f upstream.

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

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

Note for stable backports: the file to patch in versions <= 5.3 is
fs/btrfs/extent-tree.c

Fixes: 49303381 ("Btrfs: bail out if block group has different mixed flag")
CC: stable@vger.kernel.org # 4.9+
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent a5a10f78

fs/btrfs/extent-tree.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -10000,6 +10000,7 @@ int btrfs_read_block_groups(struct btrfs_fs_info *info)
		btrfs_err(info,
		"bg %llu is a mixed block group but filesystem hasn't enabled mixed block groups",
		cache->key.objectid);
		btrfs_put_block_group(cache);
		ret = -EINVAL;
		goto error;
		}