[PATCH 1/2] erofs: fix missing unmap if z_erofs_get_extent_compressedlen() fails

[Yue Hu]

On Mon,  5 Dec 2022 23:00:49 +0800
Gao Xiang <hsiangkao at linux.alibaba.com> wrote:

> Otherwise, meta buffers could be leaked.
> 
> Fixes: cec6e93beadf ("erofs: support parsing big pcluster compress indexes")
> Signed-off-by: Gao Xiang <hsiangkao at linux.alibaba.com>

Reviewed-by: Yue Hu <huyue2 at coolpad.com>

> ---
>  fs/erofs/zmap.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/erofs/zmap.c b/fs/erofs/zmap.c
> index 749a5ac943f4..98eff1259de4 100644
> --- a/fs/erofs/zmap.c
> +++ b/fs/erofs/zmap.c
> @@ -694,7 +694,7 @@ static int z_erofs_do_map_blocks(struct inode *inode,
>  		map->m_pa = blknr_to_addr(m.pblk);
>  		err = z_erofs_get_extent_compressedlen(&m, initial_lcn);
>  		if (err)
> -			goto out;
> +			goto unmap_out;
>  	}
>  
>  	if (m.headtype == Z_EROFS_VLE_CLUSTER_TYPE_PLAIN) {
> @@ -718,14 +718,12 @@ static int z_erofs_do_map_blocks(struct inode *inode,
>  		if (!err)
>  			map->m_flags |= EROFS_MAP_FULL_MAPPED;
>  	}
> +
>  unmap_out:
>  	erofs_unmap_metabuf(&m.map->buf);
> -
> -out:
>  	erofs_dbg("%s, m_la %llu m_pa %llu m_llen %llu m_plen %llu m_flags 0%o",
>  		  __func__, map->m_la, map->m_pa,
>  		  map->m_llen, map->m_plen, map->m_flags);
> -
>  	return err;
>  }
>