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

[Gao Xiang]

Otherwise, meta buffers could be leaked.

Fixes: cec6e93beadf ("erofs: support parsing big pcluster compress indexes")
Signed-off-by: Gao Xiang <hsiang...@linux.alibaba.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;
 }
 
-- 
2.24.4