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

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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: 49303381f19a ("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>
This commit is contained in:
Qu Wenruo 2019-10-10 10:39:26 +08:00 committed by prashantpaddune
parent b0489000dd
commit 12e1cecfd1
1 changed files with 1 additions and 0 deletions
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fs/btrfs/extent-tree.c
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@ -9905,6 +9905,7 @@ int btrfs_read_block_groups(struct btrfs_root *root)
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;
}