From: Pasi Kallinen <paxed@alt.org>
Date: Sun, 15 Nov 2020 11:22:45 +0000 (+0200)
Subject: Fix buffer underrun in curses
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=7cfc5a7142d06bd0ca71e9422e88bbaeba6835fd;p=nethack

Fix buffer underrun in curses
---

diff --git a/win/curses/cursmisc.c b/win/curses/cursmisc.c
index 825df06a7..0914400ea 100644
--- a/win/curses/cursmisc.c
+++ b/win/curses/cursmisc.c
@@ -691,7 +691,8 @@ curses_rtrim(char *str)
     char *s;
 
     for (s = str; *s != '\0'; ++s);
-    for (--s; isspace(*s) && s > str; --s);
+    if (s > str)
+        for (--s; isspace(*s) && s > str; --s);
     if (s == str)
         *s = '\0';
     else