X-Authentication-Warning: delorie.com: mail set sender to djgpp-bounces using -f
X-Recipient: djgpp AT delorie DOT com
X-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=mime-version:date:message-id:subject:from:to:content-type;
        bh=5M29ZabyfzPlDg5LLHh7INjj6j9AHg2f+M9viMsOgZo=;
        b=Eh0rdX5fTwp8t4vydftknb6QG9T8wC8iAaVYJAdJaIVOziLE2O/5FbnUyrPoem2QYF
         kbBeM76u/L1bKDlt1xgkcQUvdCK4wL7sLK1SNBUmIqKdGZZj+s/w57ZKIaOAuaLPBcne
         egzYeDd7uzIaCuBvNykOWbuvyOrshVdVqI2+MQvwD11vAk+Q2oFtLn6fTTBlTewURXnH
         3a/cmVoWrzjt4YiAc/Rb15eM9RqL1IL4rWUStsm41gDvn3ze1zox8hEoTjtJRC+kVr8Z
         3V/0kKrQmyQfJWA58uqq4baVMWeLqxOaQnFM/p7+CoQnS6ZVvexHizu5GrKdmcB/jnN7
         z9Mw==
MIME-Version: 1.0
X-Received: by 10.202.88.215 with SMTP id m206mr22390984oib.47.1442405424868;
 Wed, 16 Sep 2015 05:10:24 -0700 (PDT)
Date: Wed, 16 Sep 2015 15:10:24 +0300
Message-ID: <CAA2C=vCi88BYHh-yRXvtx8az13Y9wymqkjs93UJHx=qaZRPOGQ@mail.gmail.com>
Subject: dlopen.c: make sure filename is not NULL and not empty
From: "Ozkan Sezer (sezeroz AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
To: djgpp <djgpp AT delorie DOT com>
Content-Type: text/plain; charset=UTF-8
Reply-To: djgpp AT delorie DOT com

If there are no objections, I want to apply the following
patch to both HEAD and to v2_05_1.  dlopen(NULL,mode) is
supported by glibc but not by djgpp, and such a call left
unchecked will result in Bad Things (TM) to happen.

Index: dlopen.c
===================================================================
RCS file: /cvs/djgpp/djgpp/src/libc/dxe/dlopen.c,v
retrieving revision 1.9
diff -u -p -r1.9 dlopen.c
--- dlopen.c	21 Aug 2015 18:10:28 -0000	1.9
+++ dlopen.c	16 Sep 2015 12:02:07 -0000
@@ -119,6 +119,11 @@ void *dlopen(const char *filename, int m
   _dl_unresolved_count = 0;
   errno = 0;

+  if (!filename || !*filename) {
+    errno = EINVAL;
+    return NULL;
+  }
+
   /* Find the dynamic module along the LD_LIBRARY_PATH */
   if (!ACCESS(filename))
   {