[patch] fix segfault when using 'userdel -r' and homedir is /dev/null

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when userdel is called with -r, the function remove_dir() is called on the=
=20
user's homedir ... well if the user's homedir is /dev/null, the code=20
segfaults

this is because remove_dir() calls opendir() on the homedir but never check=
s=20
the return value ... so it continues on to calling readdir(NULL) and then=20
promptly segfaults

patch attached to address the issue ... Gentoo bug report in case anyone ca=
res=20
is at http://bugs.gentoo.org/139148
=2Dmike

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Index: libmisc/copydir.c
===================================================================
RCS file: /cvsroot/shadow/libmisc/copydir.c,v
retrieving revision 1.14
diff -u -p -r1.14 copydir.c
--- libmisc/copydir.c	7 May 2006 18:10:10 -0000	1.14
+++ libmisc/copydir.c	4 Jul 2006 19:42:22 -0000
@@ -396,7 +396,8 @@ int remove_tree (const char *root)
 	 * is made set-ID.
 	 */
 
-	dir = opendir (root);
+	if (!(dir = opendir (root)))
+		return -1;
 
 	while ((ent = readdir (dir))) {
 

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