isl_set_alloc: add check on number of basic sets

diff --git a/isl_map.c b/isl_map.c
index 400826c..3b3e462 100644 (file)
--- a/isl_map.c
+++ b/isl_map.c
@@ -1434,6 +1434,7 @@ struct isl_set *isl_set_alloc(struct isl_ctx *ctx,
 {
        struct isl_set *set;
 
+       isl_assert(ctx, n >= 0, return NULL);
        set = isl_alloc(ctx, struct isl_set,
                        sizeof(struct isl_set) +
                        n * sizeof(struct isl_basic_set *));