isl_map_gist_basic_map: avoid invalid access on error

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

diff --git a/isl_map_simplify.c b/isl_map_simplify.c
index c83888a..9057502 100644 (file)
--- a/isl_map_simplify.c
+++ b/isl_map_simplify.c
@@ -2182,6 +2182,8 @@ __isl_give isl_map *isl_map_gist_basic_map(__isl_take isl_map *map,
                goto error;;
        isl_assert(map->ctx, isl_space_is_equal(map->dim, context->dim), goto error);
        map = isl_map_compute_divs(map);
+       if (!map)
+               goto error;
        for (i = 0; i < map->n; ++i)
                context = isl_basic_map_align_divs(context, map->p[i]);
        for (i = map->n - 1; i >= 0; --i) {