isl_basic_map_intersect_range: avoid NULL pointer dereference

diff --git a/isl_map.c b/isl_map.c
index b91a4a3..25f5500 100644 (file)
--- a/isl_map.c
+++ b/isl_map.c
@@ -1798,10 +1798,10 @@ struct isl_basic_map *isl_basic_map_intersect_range(
                    isl_basic_map_compatible_range(bmap, bset), goto error);
 
        bmap = isl_basic_map_cow(bmap);
-       bmap = isl_basic_map_extend_dim(bmap, isl_dim_copy(bmap->dim),
-                       bset->n_div, bset->n_eq, bset->n_ineq);
        if (!bmap)
                goto error;
+       bmap = isl_basic_map_extend_dim(bmap, isl_dim_copy(bmap->dim),
+                       bset->n_div, bset->n_eq, bset->n_ineq);
        bmap_range = isl_basic_map_from_basic_set(bset, isl_dim_copy(bset->dim));
        bmap = add_constraints(bmap, bmap_range, 0, 0);