From e9fc15847232732da87ef32cee7893d0b2c0b244 Mon Sep 17 00:00:00 2001
From: tg <tg@mirbsd.org>
Date: Wed, 24 Feb 2016 01:45:59 +0000
Subject: [PATCH] =?UTF-8?q?plug=20a=20buffer=20underflow=20read=20we=20exe?=
 =?UTF-8?q?cuted=20with=20*every*=20testsuite=20run=20and=20*every*=20inte?=
 =?UTF-8?q?ractive=20shell=20session=20(history=20didn=E2=80=99t=20contain?=
 =?UTF-8?q?=20anything=20when=20we=20tested=20for=20ignoredups)=E2=80=A6?=
 =?UTF-8?q?=20first=20caught=20by=20the=20new=20code=E2=80=A6=20d=E2=80=99?=
 =?UTF-8?q?uuuuuuuuuuh!?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 histrap.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/histrap.c b/histrap.c
index 4c16fb8..5932ea3 100644
--- a/histrap.c
+++ b/histrap.c
@@ -27,7 +27,7 @@
 #include <sys/file.h>
 #endif
 
-__RCSID("$MirOS: src/bin/mksh/histrap.c,v 1.153 2016/01/21 18:24:40 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/histrap.c,v 1.154 2016/02/24 01:45:59 tg Exp $");
 
 Trap sigtraps[ksh_NSIG + 1];
 static struct sigaction Sigact_ign;
@@ -658,7 +658,9 @@ histsave(int *lnp, const char *cmd, int svmode, bool ignoredups)
 	strndupx(c, cmd, ccp - cmd, APERM);
 
 	if (svmode != HIST_APPEND) {
-		if (ignoredups && !strcmp(c, *histptr)
+		if (ignoredups &&
+		    histptr >= history &&
+		    !strcmp(c, *histptr)
 #if !defined(MKSH_SMALL) && HAVE_PERSISTENT_HISTORY
 		    && !histsync()
 #endif