isl_affine_hull.c: extend_affine_hull: avoid NULL pointer dereference

diff --git a/isl_affine_hull.c b/isl_affine_hull.c
index 7451fed..73a6590 100644 (file)
--- a/isl_affine_hull.c
+++ b/isl_affine_hull.c
@@ -403,6 +403,8 @@ static struct isl_basic_set *extend_affine_hull(struct isl_tab *tab,
                        goto error;
                point = isl_basic_set_from_vec(sample);
                hull = affine_hull(hull, point);
+               if (!hull)
+                       return NULL;
        }
 
        return hull;