From: Eric S. Raymond <esr@thyrsus.com>
Date: Tue, 20 Jun 2017 11:20:03 +0000 (-0400)
Subject: Fix off-by-one error that enabled the fuzzer to find a crash hole.
X-Git-Tag: 1.1~202
X-Git-Url: https://jxself.org/git/?p=open-adventure.git;a=commitdiff_plain;h=018ca9ae373090cf8ed94d577232b8b02759f4c6

Fix off-by-one error that enabled the fuzzer to find a crash hole.

One has to allocate space for the trailing NUL, too.
---

diff --git a/misc.c b/misc.c
index 29846e2..71c7540 100644
--- a/misc.c
+++ b/misc.c
@@ -291,7 +291,7 @@ bool YES(const char* question, const char* yes_response, const char* no_response
 
         reply = get_input();
 
-        char* firstword = (char*) xmalloc(strlen(reply));
+        char* firstword = (char*) xmalloc(strlen(reply)+1);
         sscanf(reply, "%s", firstword);
 
         for (int i = 0; i < (int)strlen(firstword); ++i)