[sudo-users] visudo: internal error, tried to emalloc2(0)

[Todd C. Miller]

This was a bug introduced in sudo 1.8.7.  The following will avoid
the error.

 - todd

diff -r da3b2b06605c plugins/sudoers/visudo.c
--- a/plugins/sudoers/visudo.c	Thu Aug 08 11:40:36 2013 -0600
+++ b/plugins/sudoers/visudo.c	Sun Aug 11 10:11:38 2013 -0600
@@ -221,6 +221,7 @@
     sudo_setgrent();
 
     /* Mock up a fake sudo_user struct. */
+    sudo_user.max_groups = -1;
     user_cmnd = "";
     if ((sudo_user.pw = sudo_getpwuid(getuid())) == NULL)
 	fatalx(_("you do not exist in the %s database"), "passwd");