btrfs: zoned: fix a leaked bioc in read_zone_info

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>

diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c
index 8aec53528efab079143e5fec756a1842fee18a1d..9892f7413705e0accad28f78fa28cc56027c15c3 100644 (file)
--- a/fs/btrfs/zoned.c
+++ b/fs/btrfs/zoned.c
@@ -1736,12 +1736,14 @@ static int read_zone_info(struct btrfs_fs_info *fs_info, u64 logical,
        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;
@@ -1760,7 +1762,8 @@ static int read_zone_info(struct btrfs_fs_info *fs_info, u64 logical,
                break;
        }
        memalloc_nofs_restore(nofs_flag);
-
+out_put_bioc:
+       btrfs_put_bioc(bioc);
        return ret;
 }