From c92ebc3908cbb2c780201e25307e03378b1eefa0 Mon Sep 17 00:00:00 2001
From: Tom Eastep <teastep@shorewall.net>
Date: Tue, 18 Oct 2016 14:32:56 -0700
Subject: [PATCH] Make merge_inline_source_dest() a little safer

Signed-off-by: Tom Eastep <teastep@shorewall.net>
---
 Shorewall/Perl/Shorewall/Rules.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Shorewall/Perl/Shorewall/Rules.pm b/Shorewall/Perl/Shorewall/Rules.pm
index 76f1361e3..a4b4239f8 100644
--- a/Shorewall/Perl/Shorewall/Rules.pm
+++ b/Shorewall/Perl/Shorewall/Rules.pm
@@ -1620,7 +1620,7 @@ sub merge_inline_source_dest( $$ ) {
     my ( $body, $invocation ) = @_;
 
     if ( $invocation ) {
-	if ( $body ) {
+	if ( supplied $body && $body ne '-' ) {
 	    return $body if $invocation eq '-';
 
 	    if ( $family == F_IPV4 ) {