X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=isl_map_subtract.c;h=2c958c766f9e801469503df13f95fa4d976a9edb;hb=7bc3560a92635b5dcf7eb9e7329992fc935a1ce2;hp=3e07311f225647812aacd3253979bedc12f7367d;hpb=bbf118d271fb69c7554bd7ff5b812b7172b5cd24;p=platform%2Fupstream%2Fisl.git

diff --git a/isl_map_subtract.c b/isl_map_subtract.c
index 3e07311..2c958c7 100644
--- a/isl_map_subtract.c
+++ b/isl_map_subtract.c
@@ -326,6 +326,8 @@ static int basic_map_collect_diff(__isl_take isl_basic_map *bmap,
 	map = isl_map_order_divs(map);
 
 	tab = isl_tab_from_basic_map(bmap, 1);
+	if (!tab)
+		goto error;
 
 	modified = 0;
 	level = 0;
@@ -775,6 +777,7 @@ static int map_is_singleton_subset(__isl_keep isl_map *map1,
 static int map_is_subset(__isl_keep isl_map *map1, __isl_keep isl_map *map2)
 {
 	int is_subset = 0;
+	int empty;
 	int rat1, rat2;
 
 	if (!map1 || !map2)
@@ -783,10 +786,16 @@ static int map_is_subset(__isl_keep isl_map *map1, __isl_keep isl_map *map2)
 	if (!isl_map_has_equal_space(map1, map2))
 		return 0;
 
-	if (isl_map_is_empty(map1))
+	empty = isl_map_is_empty(map1);
+	if (empty < 0)
+		return -1;
+	if (empty)
 		return 1;
 
-	if (isl_map_is_empty(map2))
+	empty = isl_map_is_empty(map2);
+	if (empty < 0)
+		return -1;
+	if (empty)
 		return 0;
 
 	rat1 = isl_map_has_rational(map1);