From d71ac73d8a4397c35b21ec08388a1c6f94691b64 Mon Sep 17 00:00:00 2001
From: Simon Tatham <anakin@pobox.com>
Date: Tue, 17 Mar 2020 18:12:33 +0000
Subject: [PATCH] Mines: add validation for negative mine count.

If this gets through validation, it causes an infinite loop after
gameplay begins.
---
 mines.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mines.c b/mines.c
index 00d306c..ee2d5bb 100644
--- a/mines.c
+++ b/mines.c
@@ -258,6 +258,8 @@ static const char *validate_params(const game_params *params, bool full)
      */
     if (full && params->unique && (params->w <= 2 || params->h <= 2))
 	return "Width and height must both be greater than two";
+    if (params->n < 0)
+	return "Mine count may not be negative";
     if (params->n > params->w * params->h - 9)
 	return "Too many mines for grid size";