From ee94d6ddd98d63ee0d50e373f014ab01c4edea64 Mon Sep 17 00:00:00 2001
From: UTkarsh Maheshwari <utkarshme96@gmail.com>
Date: Mon, 27 Nov 2017 19:57:15 +0530
Subject: [PATCH] Add a check for underflow in map

---
 src/map.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/map.c b/src/map.c
index bb8fb8f..f7f7b95 100644
--- 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;
 }