From cdfae7d4537476469e070564a62f980892d2d551 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?St=C3=A9phane=20Travostino?= <sph@combo.cc>
Date: Sun, 14 Dec 2025 10:15:04 +0100
Subject: [PATCH] apps/maze: fix possible stack overflow

The original code this app is inspired from uses rand(), which returns
a number >= 0.
mulberry32() on the other hand can return a negative number, in which
case will overflow the accesses in the dirs array. Fix that by forcing
the result to be unsigned.
---
 apps/maze/maze.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/apps/maze/maze.c b/apps/maze/maze.c
index d2d10a6..1c2edcd 100644
--- a/apps/maze/maze.c
+++ b/apps/maze/maze.c
@@ -42,7 +42,7 @@ void carve(int x, int y) {
     int dirs[] = {0, 1, 2, 3};
     // Fisher-Yates shuffle
     for (int i = 3; i > 0; i--) {
-        int j = mulberry32() % (i + 1);
+        int j = (unsigned)mulberry32() % (i + 1);
         int tmp = dirs[i];
         dirs[i] = dirs[j];
         dirs[j] = tmp;