erofs: fix missing unmap if z_erofs_get_extent_compressedlen() fails

Otherwise, meta buffers could be leaked.

Fixes: cec6e93beadf ("erofs: support parsing big pcluster compress indexes")
Reviewed-by: Yue Hu <huyue2@coolpad.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/20221205150050.47784-1-hsiangkao@linux.alibaba.com

diff --git a/fs/erofs/zmap.c b/fs/erofs/zmap.c
index 749a5ac943f4f1e4fea9dc3553ba71aa476192c0..98eff1259de4da6e667a8d6bf1669a22bf6aefb0 100644 (file)
--- 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;
 }