isl_convex_hull.c: map_simple_hull: avoid invalid access on error

Signed-off-by: Sven Verdoolaege <skimo@kotnet.org>

diff --git a/isl_convex_hull.c b/isl_convex_hull.c
index 3853fc1..dc8ac91 100644 (file)
--- a/isl_convex_hull.c
+++ b/isl_convex_hull.c
@@ -2342,7 +2342,7 @@ static __isl_give isl_basic_map *map_simple_hull(__isl_take isl_map *map,
        map = isl_map_detect_equalities(map);
        affine_hull = isl_map_affine_hull(isl_map_copy(map));
        map = isl_map_align_divs(map);
-       model = isl_basic_map_copy(map->p[0]);
+       model = map ? isl_basic_map_copy(map->p[0]) : NULL;
 
        set = isl_map_underlying_set(map);