[PATCH 5.18 028/231] btrfs: zoned: fix a leaked bioc in read_zone_info

Greg Kroah-Hartman
2022-07-19T12:51:19Z

From: Christoph Hellwig <hch@lst.de>

commit 2963457829decf0c824a443238d251151ed18ff5 upstream.

The bioc would leak on the normal completion path and also on the RAID56
check (but that one won't happen in practice due to the invalid
combination with zoned mode).

Fixes: 7db1c5d14dcd ("btrfs: zoned: support dev-replace in zoned filesystems")
CC: stable@vger.kernel.org # 5.16+
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
[ update changelog ]
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/btrfs/zoned.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)

--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -1727,12 +1727,14 @@ static int read_zone_info(struct btrfs_f
ret = btrfs_map_sblock(fs_info, BTRFS_MAP_GET_READ_MIRRORS, logical,
&mapped_length, &bioc);
if (ret || !bioc || mapped_length < PAGE_SIZE) {
- btrfs_put_bioc(bioc);
- return -EIO;
+ ret = -EIO;
+ goto out_put_bioc;
}

- if (bioc->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK)
- return -EINVAL;
+ if (bioc->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
+ ret = -EINVAL;
+ goto out_put_bioc;
+ }

nofs_flag = memalloc_nofs_save();
nmirrors = (int)bioc->num_stripes;
@@ -1751,7 +1753,8 @@ static int read_zone_info(struct btrfs_f
break;
}
memalloc_nofs_restore(nofs_flag);
-
+out_put_bioc:
+ btrfs_put_bioc(bioc);
return ret;
}