From 8a3fb82e230c5cf18b82f54687c2a56f53875a38 Mon Sep 17 00:00:00 2001
From: Ben Harris <bjh21@bjh21.me.uk>
Date: Tue, 10 Jan 2023 20:39:57 +0000
Subject: [PATCH] Last-ditch maximum size limit for Pearl

This makes sure that width * height <= INT_MAX, which it rather needs
to be.
---
 pearl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pearl.c b/pearl.c
index 7a9e854..9603bec 100644
--- a/pearl.c
+++ b/pearl.c
@@ -35,6 +35,7 @@
 #include <string.h>
 #include <assert.h>
 #include <ctype.h>
+#include <limits.h>
 #include <math.h>
 
 #include "puzzles.h"
@@ -272,6 +273,8 @@ static const char *validate_params(const game_params *params, bool full)
 {
     if (params->w < 5) return "Width must be at least five";
     if (params->h < 5) return "Height must be at least five";
+    if (params->w > INT_MAX / params->h)
+        return "Width times height must not be unreasonably large";
     if (params->difficulty < 0 || params->difficulty >= DIFFCOUNT)
         return "Unknown difficulty level";
     if (params->difficulty >= DIFF_TRICKY && params->w + params->h < 11)