isl_pw_aff_set_rational: avoid invalid access on error

[platform/upstream/isl.git] / isl_map_subtract.c

diff --git a/isl_map_subtract.c b/isl_map_subtract.c
index 3e07311..0e23ea3 100644 (file)
--- a/isl_map_subtract.c
+++ b/isl_map_subtract.c
@@ -775,6 +775,7 @@ 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 +784,16 @@ 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);