[PATCH] Fix BZ #219

[Jakub Jelinek <jakub at redhat dot com>]

Hi!

If __libc_dlopen of some NSS module fails, lib_handle is set to (void *) -1l,
which certainly is not something we should pass to __libc_dlclose.
Similarly, __libc_dlopen doesn't like NULL to be passed to it either,
which can happen e.g. with --enable-static-nss, not sure if in other
cases too.

2004-06-14  Jakub Jelinek  <jakub@redhat.com>

	[BZ #219]
	* nss/nsswitch.c (free_mem) : Don't try to close a library handle
	if the handle is invalid.  Patch by David Kimdon <kimdon@esrf.fr>.

--- libc/nss/nsswitch.c.jj	2003-09-14 20:13:41.000000000 +0200
+++ libc/nss/nsswitch.c	2004-06-14 15:31:33.499653270 +0200
@@ -1,4 +1,5 @@
-/* Copyright (C) 1996-1999,2001,2002,2003 Free Software Foundation, Inc.
+/* Copyright (C) 1996, 1997, 1998, 1999, 2001, 2002, 2003, 2004
+   Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
 
@@ -749,7 +750,8 @@ libc_freeres_fn (free_mem)
     {
       service_library *oldl = library;
 
-      __libc_dlclose (library->lib_handle);
+      if (library->lib_handle && library->lib_handle != (void *) -1l)
+	__libc_dlclose (library->lib_handle);
 
       library = library->next;
       free (oldl);

	Jakub