From cb298045d5976371e5302e762342dba695bed055 Mon Sep 17 00:00:00 2001
From: Sven Verdoolaege <skimo@kotnet.org>
Date: Fri, 18 Dec 2009 20:53:46 +0100
Subject: [PATCH] isl_convex_hull.c: extend: check hull argument

---
 isl_convex_hull.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/isl_convex_hull.c b/isl_convex_hull.c
index b6343539..297ae195 100644
--- a/isl_convex_hull.c
+++ b/isl_convex_hull.c
@@ -682,6 +682,9 @@ static struct isl_basic_set *extend(struct isl_basic_set *hull,
 	struct isl_basic_set *hull_facet = NULL;
 	unsigned dim;
 
+	if (!hull)
+		return NULL;
+
 	isl_assert(set->ctx, set->n > 0, goto error);
 
 	dim = isl_set_n_dim(set);
-- 
2.11.4.GIT