diff --git a/PVE/Storage/DirPlugin.pm b/PVE/Storage/DirPlugin.pm
index 23cb6bb..ab9e4bd 100644
--- a/PVE/Storage/DirPlugin.pm
+++ b/PVE/Storage/DirPlugin.pm
@@ -62,5 +62,14 @@ sub activate_storage {
     $class->SUPER::activate_storage($storeid, $scfg, $cache);    
 }
 
+sub check_config {
+    my ($self, $sectionId, $config, $create, $skipSchemaCheck) = @_;
+    my $opts = PVE::SectionConfig::check_config($self, $sectionId, $config, $create, $skipSchemaCheck);
+    return $opts if !$create;
+    if ($opts->{path} !~ m@^/[-/a-zA-Z0-9_.]+$@) {
+	die "illegal path for directory storage: $opts->{path}\n";
+    }
+    return $opts;
+}
 
 1;