From 6e587fb282c81de66c818ea2cd92be5233754cc5 Mon Sep 17 00:00:00 2001
From: PatR <rankin@nethack.org>
Date: Tue, 17 Dec 2024 13:46:25 -0800
Subject: [PATCH] fix out-of-bounds not in test_move()

Commit 0381e6162459fe01038fbcdf279a1418796a4113 fixed a problem
for mon vs hero in test_move(), but the situation can also happen
with mon vs mon which doesn't use test_move().
---
 src/uhitm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/uhitm.c b/src/uhitm.c
index b77c018e3..64eb46e3e 100644
--- a/src/uhitm.c
+++ b/src/uhitm.c
@@ -5160,6 +5160,8 @@ mhitm_knockback(
             return FALSE;
     } else {
         /* subset of test_move() */
+        if (!isok(defx + dx, defy + dy))
+            return FALSE;
         if (IS_DOOR(levl[defx][defy].typ)
             && (defx - magr->mx && defy - magr->my)
             && !doorless_door(defx, defy))