isl_basic_map_intersect: avoid NULL pointer dereference

diff --git a/isl_map.c b/isl_map.c
index ff46a29..7ac2900 100644 (file)
--- a/isl_map.c
+++ b/isl_map.c
@@ -1892,10 +1892,10 @@ struct isl_basic_map *isl_basic_map_intersect(
                sample = isl_vec_copy(bmap2->sample);
 
        bmap1 = isl_basic_map_cow(bmap1);
-       bmap1 = isl_basic_map_extend_dim(bmap1, isl_dim_copy(bmap1->dim),
-                       bmap2->n_div, bmap2->n_eq, bmap2->n_ineq);
        if (!bmap1)
                goto error;
+       bmap1 = isl_basic_map_extend_dim(bmap1, isl_dim_copy(bmap1->dim),
+                       bmap2->n_div, bmap2->n_eq, bmap2->n_ineq);
        bmap1 = add_constraints(bmap1, bmap2, 0, 0);
 
        if (sample) {