From 52b1d966d59227e716044adc0463314ec3ed6c7c Mon Sep 17 00:00:00 2001
From: Markus Uhlin <markus@nifty-networks.net>
Date: Tue, 18 Nov 2025 18:43:32 +0100
Subject: Fixed possible array underrun  --  found by PVS-Studio

---
 FICS/movecheck.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/FICS/movecheck.c b/FICS/movecheck.c
index 5f607de..bb50369 100644
--- a/FICS/movecheck.c
+++ b/FICS/movecheck.c
@@ -31,6 +31,8 @@
 
 #include "stdinclude.h"
 
+#include <err.h>
+
 #include "algcheck.h"
 #include "board.h"
 #include "common.h"
@@ -719,6 +721,15 @@ legal_move(game_state_t *gs,
 	int	legal;
 	int	move_piece;
 
+	if (gs == NULL) {
+		warnx("%s: hoser! null game state", __func__);
+		return 0;
+	} else if ((fFile < 0 && fFile != ALG_DROP) ||
+		   fFile >= (int)ARRAY_SIZE(gs->board)) {
+		warnx("%s: 'fFile' (%d) out of range", __func__, fFile);
+		return 0;
+	}
+
 	if (fFile == ALG_DROP) {
 		move_piece = fRank;
 
-- 
cgit v1.2.3