From b3f3345764b0808a7a97b9c3a2a1888fd62383a0 Mon Sep 17 00:00:00 2001
From: Ben Harris <bjh21@bjh21.me.uk>
Date: Wed, 11 Jan 2023 00:03:57 +0000
Subject: Last-ditch grid-size limit for Dominosa

At least prevent integer overflow when constructing the grid.
---
 dominosa.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/dominosa.c b/dominosa.c
index 0be1c68..25f2a0b 100644
--- a/dominosa.c
+++ b/dominosa.c
@@ -47,6 +47,7 @@
 #include <string.h>
 #include <assert.h>
 #include <ctype.h>
+#include <limits.h>
 #include <math.h>
 
 #include "puzzles.h"
@@ -243,6 +244,10 @@ static const char *validate_params(const game_params *params, bool full)
 {
     if (params->n < 1)
         return "Maximum face number must be at least one";
+    if (params->n > INT_MAX - 2 ||
+        params->n + 2 > INT_MAX / (params->n + 1))
+        return "Maximum face number must not be unreasonably large";
+
     if (params->diff >= DIFFCOUNT)
         return "Unknown difficulty rating";
     return NULL;
-- 
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