Add a check for underflow in map

coditva · Nov 27, 2017 · ee94d6d · ee94d6d
1 parent 66249cc
commit ee94d6d
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/map.c b/src/map.c
@@ -97,7 +97,8 @@ void map_set_tile(point_t point, map_tile_t tile)
 
 int convert_point_to_linear(point_t point)
 {
-    if (point.x <  map -> size.x && point.y <  map -> size.y)
+    if (point.x <  map -> size.x && point.y <  map -> size.y
+            && point.x > -1 && point.y > -1)
         return map -> size.x * point.y + point.x;
     return -1;
 }