From 8ce1ad3097ca6b92293ca767f6e4ddd98ad0d90e Mon Sep 17 00:00:00 2001
From: Mike Frysinger <vapier@gentoo.org>
Date: Tue, 16 Nov 2010 07:15:00 -0500
Subject: [PATCH] depmod.pl: add recursive sanity check

If modules contain circular dependencies, the depmod script will follow
the circle forever.  So add a simple sanity check to abort rather than
chew up the CPU.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
---
 examples/depmod.pl | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/examples/depmod.pl b/examples/depmod.pl
index 8c6548d28..f324b121a 100755
--- a/examples/depmod.pl
+++ b/examples/depmod.pl
@@ -173,6 +173,9 @@ sub add_mod_deps
 
 	$depth .= " ";
 	warn "${depth}loading deps of module: $this_module\n" if $verbose;
+	if (length($depth) > 50) {
+		die "too much recursion (circular dependencies in modules?)";
+	}
 
 	foreach my $md (keys %{$mod->{$this_module}}) {
 		add_mod_deps ($depth, $mod, $mod2, $module, $md);